Validate conversationId

Validate conversationId in WebRTC and Call message listeners.
Add conversationId in message interfaces.

GitLab: #181
Change-Id: If92a4c484b65d3f06a6c42a1c1a4463425546a6b
diff --git a/common/src/interfaces/websocket-interfaces.ts b/common/src/interfaces/websocket-interfaces.ts
index d20a18b..155df0a 100644
--- a/common/src/interfaces/websocket-interfaces.ts
+++ b/common/src/interfaces/websocket-interfaces.ts
@@ -38,10 +38,10 @@
   withVideoOn: boolean;
 }
 
-export interface WebRtcSdp extends ContactMessage {
+export interface WebRtcSdp extends CallAction {
   sdp: RTCSessionDescriptionInit;
 }
 
-export interface WebRtcIceCandidate extends ContactMessage {
+export interface WebRtcIceCandidate extends CallAction {
   candidate: RTCIceCandidate;
 }