diff --git a/pySim/esim/saip/personalization.py b/pySim/esim/saip/personalization.py
index fd601adb..2fea44f5 100644
--- a/pySim/esim/saip/personalization.py
+++ b/pySim/esim/saip/personalization.py
@@ -143,6 +143,7 @@ class ConfigurableParameter:
     max_len = None
     allow_len = None # a list of specific lengths
     default_value = None
+    default_source = None # a param_source.ParamSource subclass
 
     def __init__(self, input_value=None):
         self.input_value = input_value # the raw input value as given by caller
@@ -361,6 +362,7 @@ class BinaryParam(ConfigurableParameter):
     allow_types = (str, io.BytesIO, bytes, bytearray)
     allow_chars = '0123456789abcdefABCDEF'
     strip_chars = ' \t\r\n'
+    default_source = param_source.RandomHexDigitSource
 
     @classmethod
     def validate_val(cls, val):
@@ -388,6 +390,7 @@ class Iccid(DecimalParam):
     min_len = 18
     max_len = 20
     default_value = '0' * 18
+    default_source = param_source.IncDigitSource
 
     @classmethod
     def validate_val(cls, val):
@@ -421,6 +424,7 @@ class Imsi(DecimalParam):
     min_len = 6
     max_len = 15
     default_value = '00101' + ('0' * 10)
+    default_source = param_source.IncDigitSource
 
     @classmethod
     def apply_val(cls, pes: ProfileElementSequence, val):
@@ -632,6 +636,7 @@ class Puk(DecimalHexParam):
     rpad = 16
     keyReference = None
     default_value = '0' * allow_len
+    default_source = param_source.RandomDigitSource
 
     @classmethod
     def apply_val(cls, pes: ProfileElementSequence, val):
@@ -669,6 +674,7 @@ class Pin(DecimalHexParam):
     min_len = 4
     max_len = 8
     default_value = '0' * max_len
+    default_source = param_source.RandomDigitSource
     keyReference = None
 
     @staticmethod
@@ -786,6 +792,7 @@ class AlgorithmID(DecimalParam, AlgoConfig):
     algo_config_key = 'algorithmID'
     allow_len = 1
     default_value = 1  # Milenage
+    default_source = param_source.ConstantSource
 
     @classmethod
     def validate_val(cls, val):
@@ -816,6 +823,7 @@ class MilenageRotationConstants(BinaryParam, AlgoConfig):
     algo_config_key = 'rotationConstants'
     allow_len = 5 # length in bytes (from BinaryParam)
     default_value = '0a 0b 0c 0d 0e'
+    default_source = param_source.ConstantSource
 
     @classmethod
     def validate_val(cls, val):
@@ -848,6 +856,7 @@ class TuakNumberOfKeccak(IntegerParam, AlgoConfig):
     min_val = 1
     max_val = 255
     default_value = '1'
+    default_source = param_source.ConstantSource
 
 
 class BatchPersonalization: