diff --git a/README.md b/README.md
index e9db440..2f77e85 100644
--- a/README.md
+++ b/README.md
@@ -30,9 +30,12 @@ GSMTAP into this analyser.
 
 **APDU decoder** (server-side, rendered by the PWA):
 
-- Full APDU decode — CLA per ISO 7816-4 / ETSI coding (logical channel,
-  secure messaging, command chaining), INS names from a spec table,
-  SFI-aware P1/P2 for READ/UPDATE BINARY and record commands
+- Full APDU decode — CLA per ISO 7816-4 / ETSI coding with the **logical
+  channel 0-19** (standard channels from b2-b1, the extended channels 4-19
+  from b4-b1 per TS 102 221 §10.3), secure messaging and command chaining,
+  INS names from a spec table, SFI-aware P1/P2 for READ/UPDATE BINARY and
+  record commands; MANAGE CHANNEL replies show the channel the card
+  assigned
 - Status words — full ISO 7816-4 set plus UICC-specific values:
   `91XX` (proactive command pending), `62F1/F2/F3`, `63F1/F2` (more data),
   `9300` (SAT busy), `9850`, `9862–64`
@@ -55,7 +58,12 @@ GSMTAP into this analyser.
   decoded as a stream of **C-APDUs** (SELECT, UPDATE BINARY, …) with
   full CLA/INS/P1/P2/Lc/Le breakdown — plaintext immediately, or after
   decryption for ciphered packets
-- ATR parse (clock-rate conversion, Fi/Di, T-bitmask) and FCP/FCI TLV
+- ATR parse (clock-rate conversion, Fi/Di, T-bitmask, truncated-ATR safe)
+  and FCP/FCI TLV; the historical bytes are decoded as the UICC's
+  COMPACT-TLV objects (TS 102 221 §6.3.1) — card service data, the **card
+  capabilities** (ISO 7816-4 §8.1.1.2.7 Table 88: the assignment methods
+  and the announced maximum number of logical channels, `8 or more` for the
+  extended-capable cards) and the trailing status indicator (LCS/SW)
 
 **SIMtrace Analyser PWA** ([`frontend/`](frontend/)):
 
@@ -121,7 +129,10 @@ with the local time): `Capture started` on begin, a periodic
 `Capture stopped` (or `ERROR: capture thread stopped on error …` if the
 capture thread died unexpectedly). A mis-framed or non-SIM GSMTAP
 datagram is dropped and counted (`dropped`) rather than silently
-killing the capture. The heartbeat interval defaults to 60 s and is
+killing the capture; a `tpdu` packet that is not APDU-shaped at all
+(shorter than the header, the invalid CLA `FF` or an ISO-reserved class)
+is skipped and counted (`skipped`) — a character-level or mis-sampled
+stream no longer pollutes the decode. The heartbeat interval defaults to 60 s and is
 tunable via `--log-interval SECONDS`.
 
 The GSMTAP listener also accepts the **sigrok-iso7816-stream** decoder
diff --git a/README_RUS.md b/README_RUS.md
index ac2326d..3b3308d 100644
--- a/README_RUS.md
+++ b/README_RUS.md
@@ -31,9 +31,11 @@ SIM/UICC из UDP-потока GSMTAP (или импортирует файлы
 
 **Декодер APDU** (на стороне сервера, отображается в PWA):
 
-- Полное декодирование APDU — CLA по ISO 7816-4 / ETSI (логический канал,
-  secure messaging, chaining команд), имена INS из таблицы спецификаций,
-  учёт SFI в P1/P2 для READ/UPDATE BINARY и команд с записями
+- Полное декодирование APDU — CLA по ISO 7816-4 / ETSI с **логическим
+  каналом 0-19** (стандартные каналы из b2-b1, расширенные 4-19 из b4-b1
+  по TS 102 221 §10.3), secure messaging и chaining команд, имена INS из
+  таблицы спецификаций, учёт SFI в P1/P2 для READ/UPDATE BINARY и команд
+  с записями; ответ MANAGE CHANNEL показывает назначенный картой канал
 - Статусные слова — полный набор ISO 7816-4 плюс специфичные для UICC
   значения: `91XX` (ожидается proactive-команда), `62F1/F2/F3`,
   `63F1/F2` (больше данных), `9300` (SAT busy), `9850`, `9862–64`
@@ -57,8 +59,13 @@ SIM/UICC из UDP-потока GSMTAP (или импортирует файлы
   сообщение приложения декодируется как поток **C-APDU** (SELECT,
   UPDATE BINARY, …) с полной разбивкой CLA/INS/P1/P2/Lc/Le — сразу для
   открытого текста или после расшифровки для зашифрованных пакетов
-- Разбор ATR (пересчёт тактовой частоты, Fi/Di, битовая маска T)
-  и FCP/FCI TLV
+- Разбор ATR (пересчёт тактовой частоты, Fi/Di, битовая маска T,
+  безопасен для усечённых ATR) и FCP/FCI TLV; исторические байты
+  разбираются как COMPACT-TLV объекты UICC (TS 102 221 §6.3.1) — card
+  service data, **card capabilities** (ISO 7816-4 §8.1.1.2.7 таблица 88:
+  способы назначения и заявленное максимальное число логических каналов,
+  `8 or more` у карт с расширенными каналами) и завершающий индикатор
+  состояния (LCS/SW)
 
 **PWA SIMtrace Analyser** ([`frontend/`](frontend/)):
 
@@ -122,12 +129,15 @@ simtrace-analyser-server --capture disabled
 
 Сервер пишет в stderr информацию о жизненном цикле захвата (каждая строка
 с локальным временем): `Capture started` при старте, периодический
-heartbeat `Capture alive: session=N messages=M bytes=B dropped=D`
+heartbeat `Capture alive: session=N messages=M bytes=B dropped=D skipped=S`
 и `Capture stopped` (либо `ERROR: capture thread stopped on error …`,
 если поток захвата неожиданно умер). Неверно сформированные или не-SIM
 датаграммы GSMTAP отбрасываются и считаются (`dropped`), а не молча
-убивают захват. Интервал heartbeat по умолчанию 60 с, настраивается
-через `--log-interval SECONDS`.
+убивают захват; `tpdu`-пакет, вовсе не похожий на APDU (короче заголовка,
+недопустимый CLA `FF` или зарезервированный ISO класс `001x`),
+пропускается и считается (`skipped`) — посимвольный или миссемплированный
+поток больше не засоряет декодирование. Интервал heartbeat по умолчанию
+60 с, настраивается через `--log-interval SECONDS`.
 
 GSMTAP-листенер также принимает декодер **sigrok-iso7816-stream**
 (https://github.com/anttro/sigrok_iso7816_stream) — пассивный SIM-сниффер
diff --git a/frontend/index.html b/frontend/index.html
index 7575fac..58fe7e0 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -1302,6 +1302,7 @@ function responseRows(resp) {
     if (resp.life_cycle) rows.push(['Life cycle', resp.life_cycle]);
     if (resp.file_size != null) rows.push(['File Size', resp.file_size + ' B']);
     if (resp.short_ef_id) rows.push(['Short EF ID', resp.short_ef_id]);
+    if (resp.channel != null) rows.push(['Assigned channel', resp.channel]);
 
     if (resp.type === 'GSM' || resp.type === '3G/EPS/5G') {
         rows.push(['Auth', resp.type + (resp.status ? ' (' + resp.status + ')' : '')]);
@@ -1710,6 +1711,24 @@ function atrPpsRows(decoded) {
             if (h.life_cycle) v += ' — ' + h.life_cycle;
             if (h.sw) v += ' (SW ' + h.sw + ')';
             rows.push(['Historical', v + ' · ' + h.raw]);
+            if (h.card_capabilities) {
+                const caps = h.card_capabilities;
+                const cv = [];
+                if (caps.max_channels != null) {
+                    cv.push('logical channels: ' + (typeof caps.max_channels === 'number'
+                        ? 'up to ' + caps.max_channels : caps.max_channels));
+                }
+                if (caps.channel_assignment && caps.channel_assignment.length) {
+                    cv.push('assigned ' + caps.channel_assignment.join(', '));
+                }
+                if (caps.command_chaining) cv.push('command chaining');
+                if (caps.extended_lc_le) cv.push('extended Lc/Le');
+                rows.push(['Card capabilities', cv.join(' · ') + (cv.length ? ' · ' : '') + caps.raw]);
+            }
+            if (h.objects && h.objects.length) {
+                const names = h.objects.map(o => o.name + (o.value ? ' (' + o.value + ')' : ''));
+                rows.push(['Historical objects', names.join(', ')]);
+            }
         }
         if (decoded.tck) {
             rows.push(['TCK', '0x' + decoded.tck + (decoded.tck_valid ? ' (valid)' : ' (mismatch)')]);
@@ -2780,6 +2799,10 @@ function importSuccessText(data) {
     if (data.time_base === 'application-layer') {
         text += ' · ' + t('exact timestamps (Application Layer)');
     }
+    if (data.skipped) {
+        text += ' · ' + t('{n} packets skipped (not APDU-shaped)')
+            .replace('{n}', data.skipped);
+    }
     return text;
 }
 
@@ -3168,7 +3191,7 @@ function onFilterChange() {
 }
 
 // ──────────────────── Versioning ────────────────────
-const PWA_VERSION = '2.5.0';
+const PWA_VERSION = '2.6.0';
 const MIN_SERVER_VERSION = '2.3.0';
 
 function parseVersion(v) {
@@ -3282,6 +3305,7 @@ const LANG_RU = {
     'This looks like a COMPRION export — use \'Import COMPRION trace\'.':
         'Похоже на экспорт COMPRION — используйте «Импорт трейсов COMPRION».',
     'exact timestamps (Application Layer)': 'точные метки времени (ISO Application Layer)',
+    '{n} packets skipped (not APDU-shaped)': 'пропущено пакетов (не APDU): {n}',
     'New capture': 'Новый захват',
     'Tiles': 'Плитки',
     'List': 'Список',
diff --git a/frontend/sw.js b/frontend/sw.js
index 6e54c08..0a0396a 100644
--- a/frontend/sw.js
+++ b/frontend/sw.js
@@ -1,4 +1,4 @@
-const CACHE = 'simtrace-analyser-v71';
+const CACHE = 'simtrace-analyser-v72';
 
 const PRECACHE = [
     'index.html',
diff --git a/frontend/tests/comprion.test.js b/frontend/tests/comprion.test.js
index a5676eb..fb70f4c 100644
--- a/frontend/tests/comprion.test.js
+++ b/frontend/tests/comprion.test.js
@@ -519,6 +519,13 @@ test('stopCaptureIfRunning tolerates "no active capture" (400)', async () => {
 	assert.equal(calls, 2);
 });
 
+test('importSuccessText mentions skipped non-APDU packets', () => {
+	const text = importSuccessText({name: 'x', message_count: 3, skipped: 2});
+	assert.match(text, /3 messages/);
+	assert.match(text, /2 packets skipped \(not APDU-shaped\)/);
+	assert.doesNotMatch(importSuccessText({name: 'x', message_count: 3}), /skipped/);
+});
+
 test('loadSession stops a capture tolerantly', () => {
 	const body = extractFunc(src, 'loadSession');
 	assert.match(body, /await stopCaptureIfRunning\(\)/);
diff --git a/frontend/tests/decode_rows.test.js b/frontend/tests/decode_rows.test.js
new file mode 100644
index 0000000..02860f0
--- /dev/null
+++ b/frontend/tests/decode_rows.test.js
@@ -0,0 +1,80 @@
+// ATR/historical rows, the card-capabilities summary and the MANAGE CHANNEL
+// response row (server-decoded fields rendered by the detail panel).
+
+const { test } = require('node:test');
+const assert = require('node:assert');
+const { loadSrc, extractFunc } = require('./helpers.js');
+
+const src = loadSrc();
+eval(
+	extractFunc(src, 'ifaceValue') + '\n' +
+	extractFunc(src, 'atrPpsRows') + '\n' +
+	extractFunc(src, 'responseRows')
+);
+
+function row(rows, label) {
+	const found = rows.find(r => r[0] === label);
+	return found ? found[1] : undefined;
+}
+
+test('atrPpsRows: COMPACT-TLV historical and card capabilities', () => {
+	const rows = atrPpsRows({
+		type: 'atr',
+		historical: {
+			raw: '8031E073FE211B66D0022A761300',
+			category: 'COMPACT-TLV objects',
+			card_capabilities: {
+				raw: 'FE211B', tables: 3,
+				max_channels: 4,
+				channel_assignment: ['by the card', 'by the interface device'],
+			},
+			objects: [
+				{ tag: '3', name: 'Card service data', value: 'E0' },
+				{ tag: '7', name: 'Card capabilities', value: 'FE211B' },
+				{ tag: '6', name: 'Pre-issuing data', value: 'D0022A761300' },
+			],
+		},
+	});
+	assert.match(row(rows, 'Historical'), /COMPACT-TLV objects/);
+	const caps = row(rows, 'Card capabilities');
+	assert.match(caps, /logical channels: up to 4/);
+	assert.match(caps, /assigned by the card, by the interface device/);
+	assert.match(caps, /FE211B/);
+	assert.match(row(rows, 'Historical objects'), /Card service data \(E0\)/);
+	assert.match(row(rows, 'Historical objects'), /Pre-issuing data/);
+});
+
+test('atrPpsRows: "8 or more" logical channels', () => {
+	const rows = atrPpsRows({
+		type: 'atr',
+		historical: {
+			raw: '8031E073FE2157',
+			category: 'COMPACT-TLV objects',
+			card_capabilities: {
+				raw: 'FE2157', tables: 3,
+				max_channels: '8 or more',
+				channel_assignment: ['by the card'],
+				extended_lc_le: true,
+			},
+		},
+	});
+	const caps = row(rows, 'Card capabilities');
+	assert.match(caps, /logical channels: 8 or more/);
+	assert.match(caps, /extended Lc\/Le/);
+});
+
+test('atrPpsRows: a plain status-indicator historical stays short', () => {
+	const rows = atrPpsRows({
+		type: 'atr',
+		historical: { raw: '808105', category: 'COMPACT-TLV objects',
+			life_cycle: 'operational state (activated)' },
+	});
+	assert.match(row(rows, 'Historical'), /operational state \(activated\)/);
+	assert.equal(row(rows, 'Card capabilities'), undefined);
+});
+
+test('responseRows: MANAGE CHANNEL assigned channel', () => {
+	const html = responseRows({ channel: 5 });
+	assert.match(html, /Assigned channel/);
+	assert.match(html, /<td class="value">5<\/td>/);
+});
diff --git a/pyproject.toml b/pyproject.toml
index eaf75dc..5789ae6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.backends._legacy:_Backend"
 
 [project]
 name = "simtrace-analyser"
-version = "2.5.0"
+version = "2.6.0"
 description = "SIMtrace Analyser — APDU trace analyser for GSMTAP/PCAP captures (bundles the simtrace2-pysniff utility)"
 readme = {file = "README.md", content-type = "text/markdown"}
 license = {text = "GPL-2.0-or-later"}
diff --git a/simtrace_analyser/capture.py b/simtrace_analyser/capture.py
index ee217e6..740f0ec 100644
--- a/simtrace_analyser/capture.py
+++ b/simtrace_analyser/capture.py
@@ -10,6 +10,8 @@ from simtrace2_pysniff.gsmtap import (GsmtapReceiver, GSMTAP_SIM_ATR,
                                       GSMTAP_SIM_PPS_REQ, GSMTAP_SIM_PPS_RSP,
                                       GSMTAP_SIM_RST_EVENT, GSMTAP_SIM_VCC_EVENT)
 
+from .decode import looks_like_apdu
+
 
 def _ts():
     """Local-time stamp for server-side capture log lines."""
@@ -120,6 +122,7 @@ class CaptureManager:
         self._latest_msg_id = 0
         self._msg_count = 0
         self._byte_count = 0
+        self._skipped = 0
         self._log_interval = log_interval
 
     @property
@@ -138,6 +141,11 @@ class CaptureManager:
     def latest_msg_id(self):
         return self._latest_msg_id
 
+    @property
+    def skipped(self):
+        """Packets dropped because they were not APDU-shaped."""
+        return self._skipped
+
     @property
     def device_connected(self):
         """True while the capture device is connected, or None when the
@@ -156,6 +164,7 @@ class CaptureManager:
         self._latest_msg_id = 0
         self._msg_count = 0
         self._byte_count = 0
+        self._skipped = 0
         self._backend.start()
 
         self._thread = threading.Thread(target=self._capture_loop, daemon=True)
@@ -187,7 +196,7 @@ class CaptureManager:
             return None
         self._db.close_session(sid)
         _log(f'Capture stopped: session={sid} messages={self._msg_count} '
-             f'bytes={self._byte_count}')
+             f'bytes={self._byte_count} skipped={self._skipped}')
         return sid
 
     def _capture_loop(self):
@@ -195,6 +204,14 @@ class CaptureManager:
             for msg_type, data, flags in self._backend.iter_messages():
                 if self._session_id is None:
                     break
+                if msg_type == 'tpdu' and not looks_like_apdu(data):
+                    # Not APDU-shaped at all: a mis-sampled or character-level
+                    # GSMTAP stream would only pollute the decode.
+                    self._skipped += 1
+                    if self._skipped <= 1 or self._skipped % 100 == 0:
+                        _log(f'Capture: skipped packet {self._skipped} that is '
+                             f'not APDU-shaped — check the sniffer stream')
+                    continue
                 try:
                     elapsed = round(time.monotonic() - self._start_time, 3)
                     mid = self._db.insert_message(
@@ -226,4 +243,4 @@ class CaptureManager:
             dropped = getattr(self._backend, 'dropped', 0)
             _log(f'Capture alive: session={self._session_id} '
                  f'messages={self._msg_count} bytes={self._byte_count} '
-                 f'dropped={dropped}')
+                 f'dropped={dropped} skipped={self._skipped}')
diff --git a/simtrace_analyser/comprion.py b/simtrace_analyser/comprion.py
index 7d1e374..b94794c 100644
--- a/simtrace_analyser/comprion.py
+++ b/simtrace_analyser/comprion.py
@@ -30,7 +30,7 @@ pairing, FCP decoding and the GET RESPONSE filters all work as usual.
 import re
 import time
 
-from .decode import _fidi_dict
+from .decode import _fidi_dict, cla_channel
 
 # Unit scale for the Delay-derived timeline: the COMPRION export states no
 # clock, so this only converts the Delay column's etu into seconds (card/line
@@ -442,11 +442,16 @@ def _emit_apdu(exchange, messages, skipped, warn_bucket, warnings):
     if incoming and outgoing:
         # Case 4 on the wire (T=0): the command carries no Le, the card
         # answers 61 <len> and the terminal fetches with GET RESPONSE.
-        # The GET RESPONSE keeps the command's logical channel (CLA low bits).
+        # The GET RESPONSE keeps the command's logical channel: the terminal
+        # answers with a plain first-interindustry CLA for channels 0-3 and
+        # the further-interindustry coding for the extended channels 4-19
+        # (real traces drop the class/SM bits, TS 102 221 §10.3).
         _push(messages, t1, 'tpdu',
               head + incoming + bytes([0x61, len(outgoing)]))
         t2 = max(items[-1]['t'], t1)
-        cmd = bytes([head[0] & 0x03, 0xC0, 0x00, 0x00, len(outgoing)])
+        channel = cla_channel(head[0])
+        gr_cla = channel if channel < 4 else 0x40 | (channel - 4)
+        cmd = bytes([gr_cla, 0xC0, 0x00, 0x00, len(outgoing)])
         _push(messages, t2, 'tpdu', cmd + outgoing + sw)
     elif incoming:
         _push(messages, t1, 'tpdu', head + incoming + sw)
diff --git a/simtrace_analyser/database.py b/simtrace_analyser/database.py
index a70313a..6433c42 100644
--- a/simtrace_analyser/database.py
+++ b/simtrace_analyser/database.py
@@ -288,7 +288,7 @@ class Database:
         selection, DF, SFI map, and the last RST-reported CLK frequency.
 
         Returns ``(states, clk_hz)``."""
-        from .decode import decode_sniff_msg
+        from .decode import cla_channel, decode_sniff_msg
         rows = self._conn.execute(
             "SELECT data, type FROM messages WHERE session_id=? AND id < ? "
             "AND type IN ('tpdu','atr','change','gap','rst','vcc') "
@@ -307,7 +307,7 @@ class Database:
                 if d and d.get('clk_hz'):
                     clk_hz = d['clk_hz']
                 continue
-            channel = data[0] & 0x03 if data and len(data) >= 1 else 0
+            channel = cla_channel(data[0]) if data else 0
             st = self._channel_state(states, channel)
             ctx = dict(st['prev']) if st['prev'] else {}
             ctx['sel'] = st['sel']
@@ -387,7 +387,7 @@ class Database:
         return sel
 
     def _decode_rows(self, rows, initial_states=None, clk_hz=None, on_message=None):
-        from .decode import atr_rate_fields
+        from .decode import atr_rate_fields, cla_channel
         msgs = []
         states = dict(initial_states or {})
         last_atr_i = None       # index of the most recent ATR in *msgs*
@@ -395,7 +395,7 @@ class Database:
         for row in rows:
             channel = 0
             if row[3] == 'tpdu' and row[4] and len(row[4]) >= 5:
-                channel = row[4][0] & 0x03
+                channel = cla_channel(row[4][0])
             st = self._channel_state(states, channel)
             ctx = dict(st['prev']) if st['prev'] else {}
             ctx['sel'] = st['sel']
diff --git a/simtrace_analyser/decode.py b/simtrace_analyser/decode.py
index c56055a..7269324 100644
--- a/simtrace_analyser/decode.py
+++ b/simtrace_analyser/decode.py
@@ -108,48 +108,86 @@ def decode_sw(raw_sw):
 
 # ──────────────────── CLA byte ────────────────────
 
+# ISO 7816-4 §5.1.1 (Tables 2/3) and TS 102 221 §10.1.1/§10.3: the logical
+# channel number lives in the CLA byte in two codings —
+#   * standard channels 0-3: the two least significant bits (CLA '0X',
+#     '8X' (UICC class) and 'AX' (SIM class), TS 102 221 Table 10.3);
+#   * extended channels 4-19: the four least significant bits plus four
+#     (CLA '01x0 xxxx' further interindustry and '11x0 xxxx' ETSI-defined,
+#     TS 102 221 Table 10.4a).
+_SM_NAMES = {0: 'none', 1: 'proprietary', 2: 'SM header not authenticated',
+             3: 'SM header authenticated'}
+_CHAIN_NAMES = {0: 'last or only', 1: 'first or continuing'}
+
+
+def cla_channel(cla):
+    """The logical channel number a CLA byte addresses (0-19, TS 102 221 §10.3)."""
+    if cla & 0x40:                     # b7: 01x0 xxxx / 11x0 xxxx codings
+        return (cla & 0x0F) + 4        # b4-b1 + 4 = extended channels 4-19
+    return cla & 0x03                  # b2-b1 = standard channels 0-3
+
+
 def decode_cla(cla):
-    if cla == 0x80:
+    if cla == 0xff:
+        interclass = 'invalid (ISO 7816-4)'
+    elif 0x80 <= cla <= 0x8f:
         interclass = 'ETSI-defined (UICC/USIM)'
-    elif cla == 0xa0:
+    elif 0xa0 <= cla <= 0xaf:
         interclass = 'ETSI-defined (SIM/GSM)'
+    elif 0xc0 <= cla <= 0xef:
+        interclass = 'ETSI-defined (extended logical channels)'
+    elif 0x40 <= cla <= 0x7f:
+        interclass = 'inter-industry (further format)'
+    elif 0x20 <= cla <= 0x3f:
+        interclass = 'reserved (ISO 7816-4)'
     elif cla & 0x80:
         interclass = 'proprietary'
-    elif (cla >> 6) & 0x03 == 0x00:
+    else:
         interclass = 'inter-industry (ISO 7816-4)'
-    elif (cla >> 6) & 0x03 == 0x01:
-        interclass = 'inter-industry (further format)'
-    else:
-        interclass = 'reserved'
-    if cla & 0x80:
-        # proprietary / ETSI-defined: no standard SM/chaining/channel coding
-        result = {
-            'hex': f'{cla:02x}',
-            'interclass': interclass,
-            'channel': cla & 0x03,
-            'secure_messaging': 'none',
-            'chain': 'last or only',
-        }
-    else:
-        # ISO 7816-4 §5.1.1 first/further interindustry
-        chain_bit = (cla >> 5) & 0x01
-        chain_names = {0: 'last or only', 1: 'first or continuing'}
-        sm_names = {0: 'none', 1: 'proprietary', 2: 'SM header not authenticated',
-                    3: 'SM header authenticated'}
-        sm_ind = (cla >> 3) & 0x03
-        channel = cla & 0x03
-        if (cla >> 6) & 0x03 == 0x01:
-            channel += 4  # further format: b4-b1 = channel + 4
-        result = {
-            'hex': f'{cla:02x}',
-            'interclass': interclass,
-            'channel': channel,
-            'secure_messaging': sm_names.get(sm_ind, 'none'),
-            'chain': chain_names.get(chain_bit, 'last or only'),
-        }
+
+    result = {
+        'hex': f'{cla:02x}',
+        'interclass': interclass,
+        'channel': cla_channel(cla),
+        'secure_messaging': 'n/a',
+        'chain': 'n/a',
+    }
+    if 0x00 <= cla <= 0x1f:
+        # First interindustry values: b5 chaining, b4-b3 SM, b2-b1 channel.
+        result['secure_messaging'] = _SM_NAMES[(cla >> 2) & 0x03]
+        result['chain'] = _CHAIN_NAMES[(cla >> 4) & 0x01]
+    elif 0x40 <= cla <= 0x7f:
+        # Further interindustry values: b6 SM, b5 chaining, b4-b1 channel.
+        result['secure_messaging'] = ('none' if not cla & 0x20
+                                      else 'SM header not authenticated')
+        result['chain'] = _CHAIN_NAMES[(cla >> 4) & 0x01]
+    elif 0x80 <= cla <= 0x8f or 0xa0 <= cla <= 0xaf:
+        # UICC/SIM classes (TS 102 221 Table 10.3/10.4): b4-b3 SM, b5 = 0.
+        result['secure_messaging'] = _SM_NAMES[(cla >> 2) & 0x03]
+        result['chain'] = 'last or only'
+    elif 0xc0 <= cla <= 0xef:
+        # Extended-channel classes (TS 102 221 Table 10.4a/10.4b): b6 SM,
+        # b5 = 0.
+        result['secure_messaging'] = ('none' if not cla & 0x20
+                                      else 'SM header not authenticated')
+        result['chain'] = 'last or only'
     return result
 
 
+def looks_like_apdu(data):
+    """Conservative sanity check for a captured TPDU byte string.
+
+    Rejects only shapes that cannot be a command APDU: anything shorter than
+    the 5-byte header, the invalid CLA 'FF' (ISO 7816-4 §5.1.1) and the
+    reserved '001x xxxx' class range.  Used by the capture/import paths to
+    drop non-APDU streams (mis-sampled or character-level GSMTAP capturers)
+    instead of storing them as decodable exchanges.
+    """
+    if not data or len(data) < 5:
+        return False
+    return not (data[0] == 0xFF or 0x20 <= data[0] <= 0x3F)
+
+
 # ──────────────────── Known FIDs ────────────────────
 # The spec-sourced file/DF/SFI tables live in ef_tables.py (see its
 # header for the sources); _file_name() resolves DF-first.
@@ -461,6 +499,7 @@ APDU_SPEC = {
     },
     0x70: {
         'name': 'MANAGE CHANNEL',
+        'le': True,
         'p1': {0x00: 'Open channel', 0x80: 'Close channel'},
         'p2': {0x00: 'Auto-assign channel', **{n: f'Channel {n}' for n in range(1, 20)}},
         'body': None,
@@ -3898,6 +3937,9 @@ def decode_message(raw_data, prev=None):
                 fcp = _decode_fcp(body)
                 if fcp:
                     result['response'] = fcp
+            elif ins == 0x70:  # MANAGE CHANNEL → the channel the card assigned
+                if p1 == 0x00 and cmd_body_len == 1:
+                    result['response'] = {'channel': body[0]}
             elif ins == 0x10:  # TERMINAL PROFILE → device characteristics
                 tp = _decode_terminal_profile(body)
                 if tp:
@@ -4201,26 +4243,149 @@ def atr_rate_fields(clk_hz, decoded):
     }
 
 
+# COMPACT-TLV data object names (ISO 7816-4 §8.1.1.2; the UICC always uses
+# this form — category indicator '80', TS 102 221 §6.3.1).
+_COMPACT_TLV_NAMES = {
+    0x1: 'Country or issuer indicator', 0x2: 'Issuer identification',
+    0x3: 'Card service data', 0x4: 'Initial access data',
+    0x5: "Card issuer's data", 0x6: 'Pre-issuing data',
+    0x7: 'Card capabilities', 0x8: 'Status indicator',
+    0xf: 'Application identifier',
+}
+# Card capabilities, first software function table (ISO 7816-4 §8.1.1.2.7
+# Table 86): selection methods.
+_CARD_CAP_SELECTION = [
+    (0x80, 'full DF name'), (0x40, 'partial DF name'), (0x20, 'by path'),
+    (0x10, 'by file identifier'), (0x08, 'implicit DF selection'),
+    (0x04, 'short EF identifier'), (0x02, 'record number'),
+    (0x01, 'record identifier'),
+]
+# ...second table (Table 87): b7-b6 the write behaviour.
+_CARD_CAP_WRITE = {0x00: 'one-time', 0x20: 'proprietary', 0x40: 'write OR',
+                   0x60: 'write AND'}
+
+
+def _decode_card_capabilities(value):
+    """Card capabilities on the compact TLV '7Y': up to three software
+    function tables (ISO 7816-4 §8.1.1.2.7) — selection methods, data
+    coding, and the chaining / length / logical-channels table."""
+    out = {'raw': value.hex().upper(), 'tables': len(value)}
+    if len(value) >= 1:
+        out['selection_methods'] = [name for bit, name in _CARD_CAP_SELECTION
+                                    if value[0] & bit]
+    if len(value) >= 2:
+        unit = value[1] & 0x0F
+        out['data_coding'] = {
+            'tlv_structure': bool(value[1] & 0x80),
+            'write': _CARD_CAP_WRITE.get(value[1] & 0x60, 'reserved'),
+            'ff_first_byte': bool(value[1] & 0x10),
+            'data_unit_bytes': 2 ** (unit - 1) if unit else None,
+        }
+    if len(value) >= 3:
+        t = value[2]
+        out['command_chaining'] = bool(t & 0x80)
+        out['extended_lc_le'] = bool(t & 0x40)
+        # b5 = assignment by the card, b4 = by the interface device, b3-b1
+        # y,z,t: 4y+2z+t+1 channels (all three set = eight or more).
+        assignment = []
+        if t & 0x10:
+            assignment.append('by the card')
+        if t & 0x08:
+            assignment.append('by the interface device')
+        out['channel_assignment'] = assignment
+        y, z, v = (t >> 2) & 1, (t >> 1) & 1, t & 1
+        out['max_channels'] = ('8 or more' if y and z and v
+                               else 4 * y + 2 * z + v + 1)
+    return out
+
+
+def _parse_compact_tlvs(data):
+    """Parse COMPACT-TLV objects: one byte = tag (b8-b5) and length (b4-b1),
+    then the value (ISO 7816-4 §8.1.1.2).  A truncated object is reported,
+    never invented."""
+    objects = []
+    i = 0
+    while i < len(data):
+        head = data[i]
+        tag, length = head >> 4, head & 0x0F
+        value = data[i + 1:i + 1 + length]
+        obj = {'tag': f'{tag:X}', 'length': length,
+               'name': _COMPACT_TLV_NAMES.get(tag, 'Reserved'),
+               'value': value.hex().upper()}
+        if len(value) < length:
+            obj['truncated'] = True
+        elif tag == 0x7:
+            obj['card_capabilities'] = _decode_card_capabilities(value)
+        elif tag == 0x3 and length == 1:
+            obj['card_service'] = {
+                'selection': [name for bit, name in
+                              ((0x80, 'full DF name'),
+                               (0x40, 'partial DF name')) if value[0] & bit],
+                'ber_tlv_in_dir': bool(value[0] & 0x20),
+                'ber_tlv_in_atr': bool(value[0] & 0x10),
+                'card_with_mf': not (value[0] & 0x01),
+            }
+        objects.append(obj)
+        i += 1 + length
+    return objects
+
+
+def _status_indicator(lcs, sw1, sw2):
+    """The card's status (life cycle + processing status), ISO 7816-4
+    §8.1.1.3: '00' is not reported."""
+    out = {}
+    if lcs:
+        name = _LIFE_CYCLE.get(lcs)
+        if name:
+            out['life_cycle'] = name
+    if sw1 is not None and sw2 is not None and (sw1 or sw2):
+        out['sw'] = f'{sw1:02X}{sw2:02X}'
+    return out
+
+
 def _decode_historical(hist):
-    """Decode ATR historical bytes (ISO 7816-4 §8.1.1)."""
+    """Decode ATR historical bytes (ISO 7816-4 §8.1.1).
+
+    Category '00' carries optional COMPACT-TLVs and a mandatory trailing
+    three-byte status indicator; '80' (the value a UICC always uses,
+    TS 102 221 §6.3.1) carries COMPACT-TLVs with an optional trailing '8Y'
+    status indicator; '10' carries the DIR data reference; the rest are
+    proprietary or reserved.
+    """
     result = {'raw': hist.hex().upper()}
     cat = hist[0]
-    if cat == 0x80 and len(hist) >= 3:
-        result['category'] = 'status information (life cycle)'
-        result['sw'] = f'{hist[1]:02X}{hist[2]:02X}'
-        life_cycle = _LIFE_CYCLE.get(hist[2])
-        if life_cycle:
-            result['life_cycle'] = life_cycle
-    elif cat == 0x8F:
-        result['category'] = 'TLV list'
-    elif 0x00 <= cat <= 0x7F or 0x90 <= cat <= 0x9F:
-        result['category'] = 'proprietary'
-    elif 0x81 <= cat <= 0x8E or 0xA0 <= cat <= 0xFE:
-        result['category'] = 'reserved'
-    elif cat == 0xFF:
-        result['category'] = 'default'
+    body = hist[1:]
+    if cat == 0x00:
+        result['category'] = 'COMPACT-TLV objects + status indicator'
+        if len(body) >= 3:
+            result.update(_status_indicator(body[-3], body[-2], body[-1]))
+            body = body[:-3]
+        result['objects'] = _parse_compact_tlvs(body)
+    elif cat == 0x80:
+        result['category'] = 'COMPACT-TLV objects'
+        objects = _parse_compact_tlvs(body)
+        result['objects'] = objects
+        if objects and objects[-1]['tag'] == '8' \
+                and not objects[-1].get('truncated'):
+            last = objects.pop()
+            value = bytes.fromhex(last['value'])
+            if last['length'] == 1:
+                result.update(_status_indicator(value[0], None, None))
+            elif last['length'] == 2:
+                result.update(_status_indicator(None, value[0], value[1]))
+            elif last['length'] == 3:
+                result.update(_status_indicator(*value))
+        for obj in objects:
+            if 'card_capabilities' in obj:
+                result['card_capabilities'] = obj['card_capabilities']
+    elif cat == 0x10:
+        result['category'] = 'DIR data reference'
+        if body:
+            result['dir_reference'] = f'{body[0]:02X}'
+    elif 0x81 <= cat <= 0x8f:
+        result['category'] = 'reserved (ISO 7816-4)'
     else:
-        result['category'] = f'0x{cat:02X}'
+        result['category'] = 'proprietary'
     return result
 
 
@@ -4266,6 +4431,12 @@ def _decode_atr(data, clk_hz=None):
     cur_t = None  # protocol T governing the TA/TB/TC bytes at this level (None = global)
 
     while flags and i < len(body):
+        # The interface bytes indicated by b5-b8 of the previous byte must
+        # all fit; a truncated ATR (a mis-sampled capture) stops here
+        # instead of raising.
+        if i + bin(flags >> 4).count('1') > len(body):
+            result['truncated'] = True
+            break
         if flags & 0x10:  # TA
             b = body[i]
             i += 1
diff --git a/simtrace_analyser/server.py b/simtrace_analyser/server.py
index 776c769..d1a648a 100644
--- a/simtrace_analyser/server.py
+++ b/simtrace_analyser/server.py
@@ -9,8 +9,9 @@ from datetime import datetime
 from http.server import HTTPServer, BaseHTTPRequestHandler
 from urllib.parse import urlparse, parse_qs, quote
 
-from .database import Database
 from .capture import CaptureManager, GsmtapListener, DirectSniffer, _log
+from .database import Database
+from .decode import looks_like_apdu
 from .comprion import (ComprionError, decode_text, looks_like_comprion,
                        parse_comprion)
 from simtrace2_pysniff.gsmtap import build_gsmtap_packet, GSMTAP_SIM_ATR, GSMTAP_SIM_APDU
@@ -367,7 +368,13 @@ class RequestHandler(BaseHTTPRequestHandler):
         first_ts = packets[0][0]
         last_ts = packets[-1][0]
         rows = []
+        skipped = 0
         for ts, msg_type, payload, flags in packets:
+            # A captured 'tpdu' must at least be APDU-shaped; mis-sampled or
+            # character-level streams would only pollute the decode.
+            if msg_type == 'tpdu' and not looks_like_apdu(payload):
+                skipped += 1
+                continue
             elapsed = round(ts - first_ts, 6) if ts is not None else 0.0
             rows.append((max(0.0, elapsed), msg_type, payload, flags))
         self.db.insert_messages(session_id, rows)
@@ -382,12 +389,14 @@ class RequestHandler(BaseHTTPRequestHandler):
             self.db.close_session(session_id, duration)
 
         _log(f'Session imported: session={session_id} '
-             f'name={name or "(untitled)"} messages={len(packets)} '
-             f'bytes={sum(len(p) for _, _, p, _ in packets)}')
+             f'name={name or "(untitled)"} messages={len(rows)} '
+             f'skipped={skipped} '
+             f'bytes={sum(len(r[2]) for r in rows)}')
         self._send_json({
             'session_id': session_id,
             'name': name,
-            'message_count': len(packets),
+            'message_count': len(rows),
+            'skipped': skipped,
         })
 
     def _handle_import_comprion(self, params, raw):
diff --git a/simtrace_analyser/version.py b/simtrace_analyser/version.py
index 8b1e131..6c5b69c 100644
--- a/simtrace_analyser/version.py
+++ b/simtrace_analyser/version.py
@@ -1,3 +1,3 @@
 """Single source of truth for the SIMtrace Analyser version."""
 
-__version__ = '2.5.0'
+__version__ = '2.6.0'
diff --git a/tests/test_capture.py b/tests/test_capture.py
index ce8529c..d6428e8 100644
--- a/tests/test_capture.py
+++ b/tests/test_capture.py
@@ -66,6 +66,20 @@ class TestCaptureManager(unittest.TestCase):
         self.assertIsNotNone(db.get_session(sid))
         self.assertEqual(db.count_messages(sid), 1)
 
+    def test_non_apdu_packets_are_skipped(self):
+        # A character-level or mis-sampled stream is not APDU-shaped and must
+        # not be stored as decodable exchanges; valid rows pass.
+        backend = _FakeBackend([
+            ('tpdu', bytes.fromhex('ff10957aff10957a'), 0),
+            ('tpdu', bytes.fromhex('2d6ccfb0ff'), 0),
+            ('tpdu', bytes.fromhex('00a40004023f00'), 0),
+        ])
+        mgr, db = self._manager(backend)
+        sid = mgr.start_session()
+        self.assertEqual(mgr.stop_session(), sid)
+        self.assertEqual(db.count_messages(sid), 1)
+        self.assertEqual(mgr.skipped, 2)
+
     def test_direct_sniffer_device_disconnect(self):
         from simtrace_analyser.capture import DirectSniffer
         sn = DirectSniffer()
diff --git a/tests/test_comprion.py b/tests/test_comprion.py
index d5befc0..a1b71e1 100644
--- a/tests/test_comprion.py
+++ b/tests/test_comprion.py
@@ -252,6 +252,22 @@ class TestMessageEncoding(unittest.TestCase):
         self.assertIn('01a40004023f00612a', pairs)
         self.assertIn('01c000002a' + FCP.lower() + '9000', pairs)
 
+    def test_get_response_keeps_extended_channel(self):
+        # Extended channels (4-19) are fetched with the further-interindustry
+        # CLA: channel 4 (command 0x60 = further + SM) becomes a plain 0x40,
+        # channel 12 (0x48) stays 0x48 (TS 102 221 §10.3).
+        extra = apdu(10, '60 A4 00 04', '3F 00', FCP)
+        msgs = rows_of(build_trace(extra=extra))
+        pairs = [(data.hex()) for _t, typ, data in msgs if typ == 'tpdu']
+        self.assertIn('60a40004023f00612a', pairs)
+        self.assertIn('40c000002a' + FCP.lower() + '9000', pairs)
+
+        extra = apdu(10, '48 A4 00 04', '3F 00', FCP)
+        msgs = rows_of(build_trace(extra=extra))
+        pairs = [(data.hex()) for _t, typ, data in msgs if typ == 'tpdu']
+        self.assertIn('48a40004023f00612a', pairs)
+        self.assertIn('48c000002a' + FCP.lower() + '9000', pairs)
+
     def test_continuation_rows_join(self):
         # A long outgoing block wraps onto rows with an empty description;
         # the parser must fold them back into the element's value.
diff --git a/tests/test_decode.py b/tests/test_decode.py
index a583c9c..c7eb48b 100644
--- a/tests/test_decode.py
+++ b/tests/test_decode.py
@@ -950,11 +950,101 @@ class TestAtrPps(unittest.TestCase):
 
     def test_atr_historical_life_cycle(self):
         from simtrace_analyser.decode import _decode_atr
-        # T0 = 0x03 (3 historical bytes); historical = 80 00 05 (life cycle: operational)
-        r = _decode_atr(bytes.fromhex('3B03800005'))
+        # T0 = 0x03 (3 historical bytes).  Category '80' (the value a UICC
+        # always uses, TS 102 221 §6.3.1) carries COMPACT-TLV objects; the
+        # trailing '81' object is a status indicator holding the LCS
+        # (ISO 7816-4 §8.1.1.3).
+        r = _decode_atr(bytes.fromhex('3B03808105'))
         self.assertEqual(r['historical_len'], 3)
-        self.assertEqual(r['historical']['category'], 'status information (life cycle)')
-        self.assertEqual(r['historical']['life_cycle'], 'operational state (activated)')
+        self.assertEqual(r['historical']['category'], 'COMPACT-TLV objects')
+        self.assertEqual(r['historical']['life_cycle'],
+                         'operational state (activated)')
+        self.assertEqual(r['historical']['objects'], [])
+
+    def test_atr_historical_status_bytes(self):
+        from simtrace_analyser.decode import _decode_atr
+        # '82' = SW1-SW2, '83' = LCS + SW1-SW2 (ISO 7816-4 §8.1.1.3).
+        r = _decode_atr(bytes.fromhex('3B0480829000'))
+        self.assertEqual(r['historical']['sw'], '9000')
+        r = _decode_atr(bytes.fromhex('3B058083059000'))
+        self.assertEqual(r['historical']['life_cycle'],
+                         'operational state (activated)')
+        self.assertEqual(r['historical']['sw'], '9000')
+
+    def test_atr_historical_status_category_00(self):
+        from simtrace_analyser.decode import _decode_atr
+        # Category '00': the last three bytes are the status indicator, the
+        # bytes before it optional COMPACT-TLVs.
+        r = _decode_atr(bytes.fromhex('3B0400059000'))
+        self.assertEqual(r['historical']['category'],
+                         'COMPACT-TLV objects + status indicator')
+        self.assertEqual(r['historical']['life_cycle'],
+                         'operational state (activated)')
+        self.assertEqual(r['historical']['sw'], '9000')
+
+    def test_atr_card_capabilities(self):
+        from simtrace_analyser.decode import _decode_atr
+        # A real workspace-card ATR's historical bytes: '31 E0' card service
+        # data, '73 FE 21 1B' card capabilities (3 tables: selection methods
+        # FE, data coding 21, 1B = card-assigned channels, 4 maximum) and
+        # '66 ...' pre-issuing data.  TS 102 221 §6.3.1 pins the first two
+        # objects.
+        r = _decode_atr(bytes.fromhex('3B0E8031E073FE211B66D0022A761300'))
+        hist = r['historical']
+        self.assertEqual(hist['category'], 'COMPACT-TLV objects')
+        self.assertEqual([o['tag'] for o in hist['objects']], ['3', '7', '6'])
+        cs = hist['objects'][0]['card_service']
+        self.assertEqual(cs['selection'], ['full DF name', 'partial DF name'])
+        self.assertTrue(cs['ber_tlv_in_dir'])
+        self.assertFalse(cs['ber_tlv_in_atr'])
+        self.assertTrue(cs['card_with_mf'])
+        caps = hist['card_capabilities']
+        self.assertEqual(caps['tables'], 3)
+        self.assertEqual(caps['max_channels'], 4)
+        # b5/b4 declare the assignment methods the card supports (here both).
+        self.assertEqual(caps['channel_assignment'],
+                         ['by the card', 'by the interface device'])
+        self.assertFalse(caps['command_chaining'])
+        self.assertFalse(caps['extended_lc_le'])
+        self.assertIn('full DF name', caps['selection_methods'])
+        self.assertEqual(caps['data_coding']['write'], 'proprietary')
+
+    def test_atr_card_capabilities_extended(self):
+        from simtrace_analyser.decode import _decode_atr
+        # '73 FE 21 57': y=z=t=1 → "eight or more" logical channels
+        # (ISO 7816-4 Table 88) — the extended-channel capable cards.
+        r = _decode_atr(bytes.fromhex('3B0E8031E073FE215766D0022A761300'))
+        caps = r['historical']['card_capabilities']
+        self.assertEqual(caps['max_channels'], '8 or more')
+        self.assertEqual(caps['channel_assignment'], ['by the card'])
+        self.assertTrue(caps['extended_lc_le'])
+
+    def test_atr_historical_reserved_and_proprietary(self):
+        from simtrace_analyser.decode import _decode_atr
+        r = _decode_atr(bytes.fromhex('3B018F'))
+        self.assertEqual(r['historical']['category'],
+                         'reserved (ISO 7816-4)')
+        r = _decode_atr(bytes.fromhex('3B01A0'))
+        self.assertEqual(r['historical']['category'], 'proprietary')
+        r = _decode_atr(bytes.fromhex('3B021001'))
+        self.assertEqual(r['historical']['category'], 'DIR data reference')
+        self.assertEqual(r['historical']['dir_reference'], '01')
+
+    def test_manage_channel_response(self):
+        # MANAGE CHANNEL open: the card returns the assigned channel as the
+        # response data byte (ISO 7816-4 §7.1.5); a close carries none.
+        from simtrace_analyser.decode import decode_message
+        r = decode_message(bytes.fromhex('0070000001019110'))
+        self.assertEqual(r['p1']['name'], 'Open channel')
+        self.assertEqual(r['response'], {'channel': 1})
+        r = decode_message(bytes.fromhex('0070000001029000'))
+        self.assertEqual(r['response'], {'channel': 2})
+        r = decode_message(bytes.fromhex('00708002009000'))
+        self.assertEqual(r['p1']['name'], 'Close channel')
+        self.assertNotIn('response', r)
+        # The extended channels are assigned the same way (1-19).
+        r = decode_message(bytes.fromhex('0070000001139000'))
+        self.assertEqual(r['response'], {'channel': 0x13})
 
     def test_atr_t15_is_pps_capability(self):
         from simtrace_analyser.decode import _decode_atr
@@ -1659,6 +1749,49 @@ class TestSelectionTracking(unittest.TestCase):
             # channel 0 still selects EF_MSISDN, not channel 1's EF_IMPI.
             self.assertEqual(up['decoded']['file']['ef'], 'EF_MSISDN')
 
+    def test_extended_channel_selection_isolated(self):
+        # CLA 0x44 = further-interindustry coding, extended channel 8
+        # (TS 102 221 §10.3: b4-b1 + 4); 0x48 = channel 12.  Each channel
+        # keeps its own selection — before the channel fix the state was
+        # keyed by CLA & 0x03, so these all clobbered channel 0.
+        import tempfile
+        from simtrace_analyser.database import Database
+        with tempfile.NamedTemporaryFile(suffix='.db') as tmp:
+            db = Database(tmp.name)
+            sid = db.create_session('capture')
+            db.insert_message(sid, 0.0, 'tpdu',
+                              bytes.fromhex('00a40804047fff6f409000'))   # ch0: MSISDN
+            db.insert_message(sid, 0.1, 'tpdu',
+                              bytes.fromhex('44a40804047fff6f029000'))   # ch8: OCST
+            db.insert_message(sid, 0.2, 'tpdu',
+                              bytes.fromhex('48a40804047fff6fb79000'))   # ch12: ECC
+            read = (bytes.fromhex('b2010427') +
+                    bytes.fromhex('8109089cbeb920bdbebcb5c0ffffffffffffffffffffffffff07919752738981f7ffffffffffff') +
+                    bytes.fromhex('9000'))
+            db.insert_message(sid, 0.3, 'tpdu', bytes([0x44]) + read)
+            db.insert_message(sid, 0.4, 'tpdu', bytes([0x00]) + read)
+            db.insert_message(sid, 0.5, 'tpdu', bytes([0x48]) + read)
+            msgs = db.get_messages(sid)
+            self.assertEqual(msgs[3]['decoded']['file']['ef'], 'EF_OCST')
+            self.assertEqual(msgs[4]['decoded']['file']['ef'], 'EF_MSISDN')
+            self.assertEqual(msgs[5]['decoded']['file']['ef'], 'EF_ECC')
+            self.assertEqual(msgs[3]['decoded']['cla']['channel'], 8)
+            self.assertEqual(msgs[5]['decoded']['cla']['channel'], 12)
+
+    def test_manage_channel_opens_use_their_channel(self):
+        # The MANAGE CHANNEL open/close exchanges themselves run on the
+        # basic channel; a later extended-channel command must not disturb it.
+        import tempfile
+        from simtrace_analyser.database import Database
+        with tempfile.NamedTemporaryFile(suffix='.db') as tmp:
+            db = Database(tmp.name)
+            sid = db.create_session('capture')
+            db.insert_message(sid, 0.0, 'tpdu', bytes.fromhex('0070000001059000'))
+            db.insert_message(sid, 0.1, 'tpdu', bytes.fromhex('44a40804047fff6f079000'))
+            msgs = db.get_messages(sid)
+            self.assertEqual(msgs[0]['decoded']['response'], {'channel': 5})
+            self.assertEqual(msgs[1]['decoded']['cla']['channel'], 8)
+
 
 class TestSfiResolution(unittest.TestCase):
     def test_sfi_resolved(self):
@@ -2721,28 +2854,107 @@ class TestClaDecode(unittest.TestCase):
         self.assertEqual(r['secure_messaging'], 'SM header authenticated')
 
     def test_sm_proprietary(self):
-        # 0x0C = 0000 1100: b4-b3 = 01 → proprietary secure messaging
-        r = self._cla(0x0c)
+        # 0x04 = 0000 0100: b4-b3 = 01 → proprietary secure messaging;
+        # 0x0C = b4-b3 = 11 → header authenticated (ISO 7816-4 Table 2).
+        r = self._cla(0x04)
         self.assertEqual(r['secure_messaging'], 'proprietary')
+        r = self._cla(0x0c)
+        self.assertEqual(r['channel'], 0)
+        self.assertEqual(r['secure_messaging'], 'SM header authenticated')
 
     def test_chain_bit_b5(self):
-        # 0x20 = 0010 0000: b5=1 → first or continuing command of chain
-        r = self._cla(0x20)
+        # 0x10 = 0001 0000: b5=1 → first or continuing command of chain
+        # (ISO 7816-4 §5.1.1 Table 2).
+        r = self._cla(0x10)
         self.assertEqual(r['chain'], 'first or continuing')
 
+    def test_reserved_class_001x(self):
+        # 0x20 = 0010 0000: the '001x xxxx' range is reserved by ISO
+        # 7816-4; its bits carry no defined SM/chaining meaning.
+        r = self._cla(0x20)
+        self.assertEqual(r['interclass'], 'reserved (ISO 7816-4)')
+        self.assertEqual(r['chain'], 'n/a')
+        self.assertEqual(r['secure_messaging'], 'n/a')
+
     def test_further_interindustry_channel_offset(self):
         # 0x40 = 0100 0000: further format, channel = b4-b1 + 4 = 4
         r = self._cla(0x40)
         self.assertEqual(r['interclass'], 'inter-industry (further format)')
         self.assertEqual(r['channel'], 4)
 
+    def test_extended_channels_iso(self):
+        # TS 102 221 §10.3: the further-interindustry coding carries the
+        # extended channels 4-19 in b4-b1 (ISO 7816-4 §5.1.1 Table 3).
+        for cla, channel in ((0x44, 8), (0x49, 13), (0x4a, 14), (0x4f, 19),
+                             (0x60, 4), (0x6f, 19)):
+            r = self._cla(cla)
+            self.assertEqual(r['channel'], channel, f'CLA {cla:#04x}')
+        # b6 of the further format is the SM indication, b5 the chaining bit.
+        self.assertEqual(self._cla(0x60)['secure_messaging'],
+                         'SM header not authenticated')
+        self.assertEqual(self._cla(0x70)['chain'], 'first or continuing')
+
+    def test_extended_channels_etsi(self):
+        # TS 102 221 Table 10.4a: the ETSI '11x0 xxxx' coding addresses the
+        # extended channels too (b4-b1 + 4).
+        for cla, channel in ((0xc0, 4), (0xc5, 9), (0xcf, 19), (0xe0, 4),
+                             (0xe5, 9), (0xef, 19)):
+            r = self._cla(cla)
+            self.assertEqual(r['interclass'],
+                             'ETSI-defined (extended logical channels)',
+                             f'CLA {cla:#04x}')
+            self.assertEqual(r['channel'], channel, f'CLA {cla:#04x}')
+        # b6 is the SM indication (Table 10.4b), b5 must be 0.
+        self.assertEqual(self._cla(0xe5)['secure_messaging'],
+                         'SM header not authenticated')
+        self.assertEqual(self._cla(0xc5)['secure_messaging'], 'none')
+
     def test_etsi_uicc(self):
         r = self._cla(0x80)
         self.assertEqual(r['interclass'], 'ETSI-defined (UICC/USIM)')
+        self.assertEqual(r['channel'], 0)
+        # The low nibble of the ETSI classes carries SM (b4-b3) and the
+        # standard channel (b2-b1), TS 102 221 Table 10.3/10.4.
+        r = self._cla(0x8c)
+        self.assertEqual(r['interclass'], 'ETSI-defined (UICC/USIM)')
+        self.assertEqual(r['channel'], 0)
+        self.assertEqual(r['secure_messaging'], 'SM header authenticated')
+        r = self._cla(0x83)
+        self.assertEqual(r['channel'], 3)
 
     def test_etsi_sim(self):
         r = self._cla(0xa0)
         self.assertEqual(r['interclass'], 'ETSI-defined (SIM/GSM)')
+        r = self._cla(0xa3)
+        self.assertEqual(r['interclass'], 'ETSI-defined (SIM/GSM)')
+        self.assertEqual(r['channel'], 3)
+
+    def test_proprietary_and_invalid(self):
+        # b5 = 1 contradicts the ETSI class codings (TS 102 221 §10.1.1) and
+        # 0xFF is invalid; both keep the best-effort channel reading.
+        self.assertEqual(self._cla(0x90)['interclass'], 'proprietary')
+        self.assertEqual(self._cla(0xd5)['channel'], 9)
+        self.assertEqual(self._cla(0xff)['interclass'], 'invalid (ISO 7816-4)')
+
+    def test_cla_channel_helper(self):
+        # The tracker/state paths share this helper with decode_cla.
+        from simtrace_analyser.decode import cla_channel
+        self.assertEqual(cla_channel(0x00), 0)
+        self.assertEqual(cla_channel(0x03), 3)
+        self.assertEqual(cla_channel(0x80), 0)
+        self.assertEqual(cla_channel(0x44), 8)
+        self.assertEqual(cla_channel(0x4f), 19)
+        self.assertEqual(cla_channel(0xef), 19)
+
+    def test_looks_like_apdu(self):
+        from simtrace_analyser.decode import looks_like_apdu
+        self.assertTrue(looks_like_apdu(bytes.fromhex('00a40004023f00')))
+        self.assertTrue(looks_like_apdu(bytes.fromhex('80f2000000')))
+        self.assertFalse(looks_like_apdu(b''))
+        self.assertFalse(looks_like_apdu(bytes.fromhex('00a4')))
+        self.assertFalse(looks_like_apdu(bytes.fromhex('ff10957aff10957a')))
+        self.assertFalse(looks_like_apdu(bytes.fromhex('2d6ccfb0ff')))
+        self.assertFalse(looks_like_apdu(bytes.fromhex('31e073fe211b66')))
 
 
 class TestLineEvents(unittest.TestCase):
diff --git a/tests/test_filetrack.py b/tests/test_filetrack.py
index 2149886..1f6e466 100644
--- a/tests/test_filetrack.py
+++ b/tests/test_filetrack.py
@@ -512,6 +512,25 @@ class TestNaming(TrackerCase):
         self.assertEqual(entry['path'], 'ADF/EF_SMS (6F3C)')
         self.assertEqual(entry['counters']['select'], 1)
 
+    def test_selections_are_per_extended_channel(self):
+        # CLA 0x44 / 0x48 address the extended channels 8 / 12 (TS 102 221
+        # §10.3); each channel's selection drives its own reads.  Before the
+        # channel fix both CLAs collapsed into channel 0's state, so both
+        # reads resolved to the last selected file.
+        data = self.track(
+            '44' + sel_fid('7fff')[2:], '44' + gr(fcp('7fff'))[2:],
+            '44' + sel_fid('6f07')[2:], '44' + gr(fcp('6f07', size=9))[2:],
+            '48' + sel_fid('7fff')[2:], '48' + gr(fcp('7fff'))[2:],
+            '48' + sel_fid('6fb7')[2:], '48' + gr(fcp('6fb7', size=2))[2:],
+            '44' + read_binary(0, '082905102143658709')[2:],
+            '48' + read_binary(0, '0A0B')[2:],
+        )
+        self.assertIn('7fff/6f07', data['files'])
+        self.assertIn('7fff/6fb7', data['files'])
+        self.assertEqual(data['files']['7fff/6f07']['counters']['read'], 1)
+        self.assertEqual(data['files']['7fff/6fb7']['counters']['read'], 1)
+        self.assertEqual(data['files']['7fff/6f07']['name'], 'EF_IMSI')
+
     def test_sim_df_names(self):
         # The same FID resolves against the SIM DF_GSM table.
         data = self.track(
diff --git a/tests/test_pcap_import.py b/tests/test_pcap_import.py
index c39b37a..126085a 100644
--- a/tests/test_pcap_import.py
+++ b/tests/test_pcap_import.py
@@ -224,7 +224,7 @@ class TestImportEndpoint(unittest.TestCase):
 class TestVersion(unittest.TestCase):
     def test_package_version(self):
         from simtrace2_pysniff import __version__
-        self.assertEqual(__version__, '2.5.0')
+        self.assertEqual(__version__, '2.6.0')
 
     def test_status_includes_version(self):
         import os