diff --git a/ts/session/constants.ts b/ts/session/constants.ts
index 0ed905b8f..b5ef23e87 100644
--- a/ts/session/constants.ts
+++ b/ts/session/constants.ts
@@ -14,6 +14,7 @@ export const DURATION = {
 
 export const TTL_DEFAULT = {
   TYPING_MESSAGE: 20 * DURATION.SECONDS,
+  CALL_MESSAGE: 5 * 60 * DURATION.SECONDS,
   TTL_MAX: 14 * DURATION.DAYS,
 };
 
diff --git a/ts/session/messages/outgoing/controlMessage/CallMessage.ts b/ts/session/messages/outgoing/controlMessage/CallMessage.ts
new file mode 100644
index 000000000..59e3a5b79
--- /dev/null
+++ b/ts/session/messages/outgoing/controlMessage/CallMessage.ts
@@ -0,0 +1,50 @@
+import { SignalService } from '../../../../protobuf';
+import { MessageParams } from '../Message';
+import { ContentMessage } from '..';
+import { signalservice } from '../../../../protobuf/compiled';
+import { TTL_DEFAULT } from '../../../constants';
+interface CallMessageMessageParams extends MessageParams {
+  type: SignalService.CallMessage.Type;
+  sdpMLineIndexes: Array<number>;
+  sdpMids: Array<string>;
+  sdps: Array<string>;
+  referencedAttachmentTimestamp: number;
+}
+
+export class CallMessageMessage extends ContentMessage {
+  public readonly type: signalservice.CallMessage.Type;
+  public readonly sdpMLineIndexes: Array<number>;
+  public readonly sdpMids: Array<string>;
+  public readonly sdps: Array<string>;
+
+  constructor(params: CallMessageMessageParams) {
+    super({ timestamp: params.timestamp, identifier: params.identifier });
+    this.type = params.type;
+    this.sdpMLineIndexes = params.sdpMLineIndexes;
+    this.sdpMids = params.sdpMids;
+    this.sdps = params.sdps;
+    // this does not make any sense
+    if (this.type !== signalservice.CallMessage.Type.END_CALL && this.sdps.length === 0) {
+      throw new Error('sdps must be set unless this is a END_CALL type message');
+    }
+  }
+
+  public contentProto(): SignalService.Content {
+    return new SignalService.Content({
+      callMessage: this.dataCallProto(),
+    });
+  }
+
+  public ttl() {
+    return TTL_DEFAULT.CALL_MESSAGE;
+  }
+
+  private dataCallProto(): SignalService.CallMessage {
+    return new SignalService.CallMessage({
+      type: this.type,
+      sdpMLineIndexes: this.sdpMLineIndexes,
+      sdpMids: this.sdpMids,
+      sdps: this.sdps,
+    });
+  }
+}