diff --git a/pkg/proto/rtc/rtc.proto b/pkg/proto/rtc/rtc.proto
index ce9ca472b..e72906866 100644
--- a/pkg/proto/rtc/rtc.proto
+++ b/pkg/proto/rtc/rtc.proto
@@ -100,6 +100,7 @@ message SignalReq {
       SignalAcceptReq accept = 4;
       SignalHungUpReq hungUp = 5;
       SignalRejectReq reject = 6;
+      SignalGetRoomByGroupIDReq GetRoomByGroupID = 7;
   }
 }
 
@@ -111,6 +112,7 @@ message SignalResp {
     SignalAcceptReply accept = 4;
     SignalHungUpReply hungUp = 5;
     SignalRejectReply reject = 6;
+    SignalGetRoomByGroupIDReply GetRoomByGroupID = 7;
   }
 }
 
@@ -202,6 +204,19 @@ message SignalRejectReply {
 
 }
 
+message SignalGetRoomByGroupIDReq {
+  string opUserID = 1;
+  string groupID = 2;
+}
+
+message SignalGetRoomByGroupIDReply {
+  InvitationInfo invitation = 1;
+  repeated string onConnectingUserIDList = 2;
+  string token = 3;
+  string roomID = 4;
+  string liveURL = 5;
+}
+
 message SignalMessageAssembleReq {
  SignalReq signalReq = 1;
  string operationID = 2;