diff --git a/packages/stream_video/lib/src/call/state/mixins/state_lifecycle_mixin.dart b/packages/stream_video/lib/src/call/state/mixins/state_lifecycle_mixin.dart
index 64fd6ce8e..783af6af0 100644
--- a/packages/stream_video/lib/src/call/state/mixins/state_lifecycle_mixin.dart
+++ b/packages/stream_video/lib/src/call/state/mixins/state_lifecycle_mixin.dart
@@ -274,6 +274,7 @@ extension on CallMetadata {
               roles: user?.roles ?? [participant.role],
               name: user?.name ?? '',
               custom: user?.custom ?? {},
+              customData: user?.custom ?? {},
               image: user?.image ?? '',
               sessionId: sessionId,
               isLocal: isLocal,
@@ -284,6 +285,7 @@ extension on CallMetadata {
               roles: user?.roles ?? [participant.role],
               name: user?.name ?? '',
               custom: user?.custom ?? {},
+              customData: user?.custom ?? {},
               image: user?.image ?? '',
               sessionId: participant.userSessionId,
               trackIdPrefix: '',
diff --git a/packages/stream_video/lib/src/call/state/mixins/state_sfu_mixin.dart b/packages/stream_video/lib/src/call/state/mixins/state_sfu_mixin.dart
index 20602553f..1f15e870a 100644
--- a/packages/stream_video/lib/src/call/state/mixins/state_sfu_mixin.dart
+++ b/packages/stream_video/lib/src/call/state/mixins/state_sfu_mixin.dart
@@ -231,6 +231,7 @@ mixin StateSfuMixin on StateNotifier<CallState>, StatePendingTracksMixin {
       roles: event.participant.roles,
       name: event.participant.userName,
       custom: event.participant.custom,
+      customData: event.participant.customData,
       image: event.participant.userImage,
       sessionId: event.participant.sessionId,
       trackIdPrefix: event.participant.trackLookupPrefix,
@@ -274,6 +275,7 @@ mixin StateSfuMixin on StateNotifier<CallState>, StatePendingTracksMixin {
             .copyWith(
               name: participant.userName,
               custom: participant.custom,
+              customData: participant.customData,
               image: participant.userImage,
               trackIdPrefix: participant.trackLookupPrefix,
               isSpeaking: participant.isSpeaking,
diff --git a/packages/stream_video/lib/src/models/call_participant_state.dart b/packages/stream_video/lib/src/models/call_participant_state.dart
index ec360347c..90852d3e0 100644
--- a/packages/stream_video/lib/src/models/call_participant_state.dart
+++ b/packages/stream_video/lib/src/models/call_participant_state.dart
@@ -21,6 +21,7 @@ class CallParticipantState
     required this.roles,
     required this.name,
     required this.custom,
+    this.customData = const {},
     this.image,
     required this.sessionId,
     required this.trackIdPrefix,
@@ -46,6 +47,7 @@ class CallParticipantState
     required this.roles,
     required this.name,
     required this.custom,
+    required this.customData,
     required this.image,
     required this.sessionId,
     required this.trackIdPrefix,
@@ -68,7 +70,9 @@ class CallParticipantState
   final String userId;
   final List<String> roles;
   final String name;
+  @Deprecated('Use customData instead')
   final Map<String, Object?> custom;
+  final Map<String, Object?> customData;
   final String? image;
   final String sessionId;
   final String trackIdPrefix;
@@ -111,6 +115,7 @@ class CallParticipantState
     List<String>? roles,
     String? name,
     Map<String, Object?>? custom,
+    Map<String, Object?>? customData,
     String? image,
     String? sessionId,
     String? trackIdPrefix,
@@ -134,6 +139,7 @@ class CallParticipantState
       roles: roles ?? this.roles,
       name: name ?? this.name,
       custom: custom ?? this.custom,
+      customData: customData ?? this.customData,
       image: image ?? this.image,
       sessionId: sessionId ?? this.sessionId,
       trackIdPrefix: trackIdPrefix ?? this.trackIdPrefix,
@@ -181,6 +187,7 @@ class CallParticipantState
       roles: roles,
       name: name,
       custom: custom,
+      customData: customData,
       image: image,
       sessionId: sessionId,
       trackIdPrefix: trackIdPrefix,
@@ -213,6 +220,7 @@ class CallParticipantState
       roles: roles,
       name: name,
       custom: custom,
+      customData: customData,
       image: image,
       sessionId: sessionId,
       trackIdPrefix: trackIdPrefix,
@@ -272,6 +280,7 @@ class CallParticipantState
     roles,
     name,
     custom,
+    customData,
     image,
     sessionId,
     trackIdPrefix,
diff --git a/packages/stream_video/lib/src/sfu/data/events/sfu_event_mapper_extensions.dart b/packages/stream_video/lib/src/sfu/data/events/sfu_event_mapper_extensions.dart
index 0594ff01b..dea94b7dd 100644
--- a/packages/stream_video/lib/src/sfu/data/events/sfu_event_mapper_extensions.dart
+++ b/packages/stream_video/lib/src/sfu/data/events/sfu_event_mapper_extensions.dart
@@ -255,6 +255,7 @@ extension SfuParticipantExtension on sfu_models.Participant {
       userImage: image,
       sessionId: sessionId,
       custom: custom.fields,
+      customData: (custom.toProto3Json() as Map<String, Object?>?) ?? {},
       publishedTracks: publishedTracks
           .map(
             (track) => track.toDomain(),
diff --git a/packages/stream_video/lib/src/sfu/data/models/sfu_participant.dart b/packages/stream_video/lib/src/sfu/data/models/sfu_participant.dart
index 0bbe28396..c9df56a76 100644
--- a/packages/stream_video/lib/src/sfu/data/models/sfu_participant.dart
+++ b/packages/stream_video/lib/src/sfu/data/models/sfu_participant.dart
@@ -11,6 +11,7 @@ class SfuParticipant with EquatableMixin {
     required this.userImage,
     required this.sessionId,
     required this.custom,
+    required this.customData,
     required this.publishedTracks,
     required this.joinedAt,
     required this.trackLookupPrefix,
@@ -27,6 +28,7 @@ class SfuParticipant with EquatableMixin {
   final String userImage;
   final String sessionId;
   final Map<String, Object?> custom;
+  final Map<String, Object?> customData;
   final List<SfuTrackType> publishedTracks;
   final DateTime joinedAt;
   final String trackLookupPrefix;
@@ -43,6 +45,7 @@ class SfuParticipant with EquatableMixin {
     String? userImage,
     String? sessionId,
     Map<String, Object?>? custom,
+    Map<String, Object?>? customData,
     List<SfuTrackType>? publishedTracks,
     DateTime? joinedAt,
     String? trackLookupPrefix,
@@ -58,6 +61,7 @@ class SfuParticipant with EquatableMixin {
     userImage: userId ?? this.userImage,
     sessionId: sessionId ?? this.sessionId,
     custom: custom ?? this.custom,
+    customData: customData ?? this.customData,
     publishedTracks: publishedTracks ?? this.publishedTracks,
     joinedAt: joinedAt ?? this.joinedAt,
     trackLookupPrefix: trackLookupPrefix ?? this.trackLookupPrefix,
@@ -87,6 +91,7 @@ class SfuParticipant with EquatableMixin {
     userImage,
     sessionId,
     custom,
+    customData,
     publishedTracks,
     joinedAt,
     trackLookupPrefix,
diff --git a/packages/stream_video/lib/src/sfu/sfu_extensions.dart b/packages/stream_video/lib/src/sfu/sfu_extensions.dart
index 954733b5c..7951393dc 100644
--- a/packages/stream_video/lib/src/sfu/sfu_extensions.dart
+++ b/packages/stream_video/lib/src/sfu/sfu_extensions.dart
@@ -48,6 +48,7 @@ extension SfuParticipantX on SfuParticipant {
       roles: roles.isNotEmpty ? roles : existingRoles,
       name: userName.ifEmpty(() => existingName),
       custom: custom,
+      customData: customData,
       image: userImage.ifEmpty(() => existingImage),
       sessionId: sessionId,
       trackIdPrefix: trackLookupPrefix,
diff --git a/packages/stream_video/test/src/call/call_state_notifier_test.dart b/packages/stream_video/test/src/call/call_state_notifier_test.dart
index cbe49fb8d..bb92102ef 100644
--- a/packages/stream_video/test/src/call/call_state_notifier_test.dart
+++ b/packages/stream_video/test/src/call/call_state_notifier_test.dart
@@ -48,6 +48,7 @@ void main() {
           userImage: '',
           sessionId: 'remote-session',
           custom: const {},
+          customData: const {},
           publishedTracks: const [],
           joinedAt: DateTime.now(),
           trackLookupPrefix: 'remote-track-123',
@@ -98,6 +99,7 @@ void main() {
           userImage: '',
           sessionId: 'remote-session',
           custom: const {},
+          customData: const {},
           publishedTracks: const [],
           joinedAt: DateTime.now(),
           trackLookupPrefix: 'remote-track-123',
@@ -158,6 +160,7 @@ void main() {
           userImage: '',
           sessionId: 'remote-session',
           custom: const {},
+          customData: const {},
           publishedTracks: const [],
           joinedAt: DateTime.now(),
           trackLookupPrefix: 'remote-track-123',
@@ -226,6 +229,7 @@ void main() {
           userImage: '',
           sessionId: 'remote-session',
           custom: const {},
+          customData: const {},
           publishedTracks: const [],
           joinedAt: DateTime.now(),
           trackLookupPrefix: 'remote-track-123',
@@ -315,6 +319,7 @@ void main() {
           userImage: '',
           sessionId: 'remote-session',
           custom: const {},
+          customData: const {},
           publishedTracks: const [],
           joinedAt: DateTime.now(),
           trackLookupPrefix: 'remote-track-123',