diff --git a/sdk/communication/azure-communication-chat/azure/communication/chat/_shared/models.py b/sdk/communication/azure-communication-chat/azure/communication/chat/_shared/models.py
index 4aff60e0c4df..30fa9d3327ac 100644
--- a/sdk/communication/azure-communication-chat/azure/communication/chat/_shared/models.py
+++ b/sdk/communication/azure-communication-chat/azure/communication/chat/_shared/models.py
@@ -108,13 +108,13 @@ class UnknownIdentifier(object):
     Represents an identifier of an unknown type.
     It will be encountered in communications with endpoints that are not
     identifiable by this version of the SDK.
-    :ivar identifier: Unknown communication identifier.
-    :vartype identifier: str
+    :ivar raw_id: Unknown communication identifier.
+    :vartype raw_id: str
     :param identifier: Value to initialize UnknownIdentifier.
     :type identifier: str
     """
     def __init__(self, identifier):
-        self.identifier = identifier
+        self.raw_id = identifier
 
 class _CaseInsensitiveEnumMeta(EnumMeta):
     def __getitem__(self, name):
@@ -148,7 +148,7 @@ class MicrosoftTeamsUserIdentifier(object):
     :vartype user_id: str
     :param user_id: Value to initialize MicrosoftTeamsUserIdentifier.
     :type user_id: str
-    :ivar rawId: Raw id of the Microsoft Teams user.
+    :ivar raw_id: Raw id of the Microsoft Teams user.
     :vartype raw_id: str
     :ivar cloud: Cloud environment that this identifier belongs to
     :vartype cloud: CommunicationCloudEnvironment
diff --git a/sdk/communication/azure-communication-chat/azure/communication/chat/communication_identifier_serializer.py b/sdk/communication/azure-communication-chat/azure/communication/chat/communication_identifier_serializer.py
index 972716b833be..13e540c7a67c 100644
--- a/sdk/communication/azure-communication-chat/azure/communication/chat/communication_identifier_serializer.py
+++ b/sdk/communication/azure-communication-chat/azure/communication/chat/communication_identifier_serializer.py
@@ -3,6 +3,7 @@
 # Licensed under the MIT License. See License.txt in the project root for
 # license information.
 # --------------------------------------------------------------------------
+from enum import Enum
 
 from ._generated.models import (
     CommunicationIdentifierModel,
@@ -17,12 +18,17 @@
     UnknownIdentifier,
 )
 
+class _IdentifierType(Enum):
+    COMMUNICATION_USER_IDENTIFIER = "COMMUNICATION_USER_IDENTIFIER"
+    PHONE_NUMBER_IDENTIFIER = "PHONE_NUMBER_IDENTIFIER"
+    UNKNOWN_IDENTIFIER = "UNKNOWN_IDENTIFIER"
+    MICROSOFT_TEAMS_IDENTIFIER = "MICROSOFT_TEAMS_IDENTIFIER"
+
 class CommunicationUserIdentifierSerializer(object):
 
     @classmethod
     def serialize(cls, communicationIdentifier):
         """ Serialize the Communication identifier into CommunicationIdentifierModel
-
         :param identifier: Identifier object
         :type identifier: Union[CommunicationUserIdentifier,
            PhoneNumberIdentifier, MicrosoftTeamsUserIdentifier, UnknownIdentifier]
@@ -30,16 +36,18 @@ def serialize(cls, communicationIdentifier):
         :rtype: ~azure.communication.chat.CommunicationIdentifierModel
         :raises Union[TypeError, ValueError]
         """
-        if isinstance(communicationIdentifier, CommunicationUserIdentifier):
+        identifierType = CommunicationUserIdentifierSerializer._getIdentifierType(communicationIdentifier)
+
+        if identifierType == _IdentifierType.COMMUNICATION_USER_IDENTIFIER:
             return CommunicationIdentifierModel(
                 communication_user=CommunicationUserIdentifierModel(id=communicationIdentifier.identifier)
             )
-        if isinstance(communicationIdentifier, PhoneNumberIdentifier):
+        if identifierType == _IdentifierType.PHONE_NUMBER_IDENTIFIER:
             return CommunicationIdentifierModel(
                 raw_id=communicationIdentifier.raw_id,
                 phone_number=PhoneNumberIdentifierModel(value=communicationIdentifier.phone_number)
             )
-        if isinstance(communicationIdentifier, MicrosoftTeamsUserIdentifier):
+        if identifierType == _IdentifierType.MICROSOFT_TEAMS_IDENTIFIER:
             return CommunicationIdentifierModel(
                 raw_id=communicationIdentifier.raw_id,
                 microsoft_teams_user=MicrosoftTeamsUserIdentifierModel(user_id=communicationIdentifier.user_id,
@@ -47,9 +55,9 @@ def serialize(cls, communicationIdentifier):
                 cloud=communicationIdentifier.cloud)
             )
 
-        if isinstance(communicationIdentifier, UnknownIdentifier):
+        if identifierType == _IdentifierType.UNKNOWN_IDENTIFIER:
             return CommunicationIdentifierModel(
-                raw_id=communicationIdentifier.identifier
+                raw_id=communicationIdentifier.raw_id
             )
 
         raise TypeError("Unsupported identifier type " + communicationIdentifier.__class__.__name__)
@@ -71,7 +79,6 @@ def assertMaximumOneNestedModel(cls, identifierModel):
     def deserialize(cls, identifierModel):
         """
         Deserialize the CommunicationIdentifierModel into Communication Identifier
-
         :param identifierModel: CommunicationIdentifierModel
         :type identifierModel: CommunicationIdentifierModel
         :return: Union[CommunicationUserIdentifier, CommunicationPhoneNumberIdentifier]
@@ -106,3 +113,20 @@ def deserialize(cls, identifierModel):
             )
 
         return UnknownIdentifier(raw_id)
+
+    @classmethod
+    def _getIdentifierType(cls, communicationIdentifier):
+        def has_attributes(obj, attributes):
+            return all([hasattr(obj, attr) for attr in attributes])
+
+        if has_attributes(communicationIdentifier, ["identifier"]):
+            return _IdentifierType.COMMUNICATION_USER_IDENTIFIER
+
+        if has_attributes(communicationIdentifier, ['phone_number', 'raw_id']):
+            return _IdentifierType.PHONE_NUMBER_IDENTIFIER
+
+        if has_attributes(communicationIdentifier, ["raw_id", "user_id", "is_anonymous", "cloud"]):
+            return _IdentifierType.MICROSOFT_TEAMS_IDENTIFIER
+
+        if has_attributes(communicationIdentifier, ["raw_id"]):
+            return _IdentifierType.UNKNOWN_IDENTIFIER
diff --git a/sdk/communication/azure-communication-chat/tests/_shared/test_communication_identifier_serializer.py b/sdk/communication/azure-communication-chat/tests/_shared/test_communication_identifier_serializer.py
index 64bf4e403851..b6888d2f3826 100644
--- a/sdk/communication/azure-communication-chat/tests/_shared/test_communication_identifier_serializer.py
+++ b/sdk/communication/azure-communication-chat/tests/_shared/test_communication_identifier_serializer.py
@@ -94,7 +94,7 @@ def test_deserialize_unknown_identifier(self):
         unknown_identifier_expected = UnknownIdentifier("an id")
 
         assert isinstance(unknown_identifier_actual, UnknownIdentifier)
-        assert unknown_identifier_actual.identifier == unknown_identifier_expected.identifier
+        assert unknown_identifier_actual.raw_id == unknown_identifier_expected.raw_id
 
     def test_serialize_phone_number(self):
         phone_number_identifier_model = CommunicationUserIdentifierSerializer.serialize(
diff --git a/sdk/communication/azure-communication-identity/azure/communication/identity/_shared/models.py b/sdk/communication/azure-communication-identity/azure/communication/identity/_shared/models.py
index 83bab3945635..67e0a1ff6e2b 100644
--- a/sdk/communication/azure-communication-identity/azure/communication/identity/_shared/models.py
+++ b/sdk/communication/azure-communication-identity/azure/communication/identity/_shared/models.py
@@ -37,13 +37,13 @@ class UnknownIdentifier(object):
     Represents an identifier of an unknown type.
     It will be encountered in communications with endpoints that are not
     identifiable by this version of the SDK.
-    :ivar identifier: Unknown communication identifier.
-    :vartype identifier: str
+    :ivar raw_id: Unknown communication identifier.
+    :vartype raw_id: str
     :param identifier: Value to initialize UnknownIdentifier.
     :type identifier: str
     """
     def __init__(self, identifier):
-        self.identifier = identifier
+        self.raw_id = identifier
 
 class _CaseInsensitiveEnumMeta(EnumMeta):
     def __getitem__(cls, name):
diff --git a/sdk/communication/azure-communication-phonenumbers/azure/communication/phonenumbers/_shared/models.py b/sdk/communication/azure-communication-phonenumbers/azure/communication/phonenumbers/_shared/models.py
index 83bab3945635..67e0a1ff6e2b 100644
--- a/sdk/communication/azure-communication-phonenumbers/azure/communication/phonenumbers/_shared/models.py
+++ b/sdk/communication/azure-communication-phonenumbers/azure/communication/phonenumbers/_shared/models.py
@@ -37,13 +37,13 @@ class UnknownIdentifier(object):
     Represents an identifier of an unknown type.
     It will be encountered in communications with endpoints that are not
     identifiable by this version of the SDK.
-    :ivar identifier: Unknown communication identifier.
-    :vartype identifier: str
+    :ivar raw_id: Unknown communication identifier.
+    :vartype raw_id: str
     :param identifier: Value to initialize UnknownIdentifier.
     :type identifier: str
     """
     def __init__(self, identifier):
-        self.identifier = identifier
+        self.raw_id = identifier
 
 class _CaseInsensitiveEnumMeta(EnumMeta):
     def __getitem__(cls, name):
diff --git a/sdk/communication/azure-communication-sms/azure/communication/sms/_shared/models.py b/sdk/communication/azure-communication-sms/azure/communication/sms/_shared/models.py
index 2e64b18dc068..adb6f909dd23 100644
--- a/sdk/communication/azure-communication-sms/azure/communication/sms/_shared/models.py
+++ b/sdk/communication/azure-communication-sms/azure/communication/sms/_shared/models.py
@@ -37,13 +37,13 @@ class UnknownIdentifier(object):
     Represents an identifier of an unknown type.
     It will be encountered in communications with endpoints that are not
     identifiable by this version of the SDK.
-    :ivar identifier: Unknown communication identifier.
-    :vartype identifier: str
+    :ivar raw_id: Unknown communication identifier.
+    :vartype raw_id: str
     :param identifier: Value to initialize UnknownIdentifier.
     :type identifier: str
     """
     def __init__(self, identifier):
-        self.identifier = identifier
+        self.raw_id = identifier
 
 class CommunicationIdentifierModel(msrest.serialization.Model):
     """Communication Identifier Model.