fix msi for 2 friends calling each other at the same time

toxav/msi.c

@@ -826,14 +826,21 @@ static void handle_init(MSICall *call, const MSIMessage *msg)
             /* Call starting */
             LOGGER_API_INFO(call->session->tox,"MSI_CALL_REQUESTING:Friend sent an invite, but we are waiting for an call answer to our call");
 
-            /* if 2 friends call each other at the same time, ignore for now */
-#if 0
+            /* if 2 friends call each other at the same time */
+#if 1
             call->peer_capabilities = msg->capabilities.value;
             call->state = MSI_CALL_ACTIVE;
 
             if (invoke_callback(call, MSI_ON_START) == -1) {
                 goto FAILURE;
             }
+
+            // send the correct answer to the other friend
+            MSIMessage out_msg;
+            msg_init(&out_msg, REQU_PUSH);
+            out_msg.capabilities.exists = true;
+            out_msg.capabilities.value = call->self_capabilities;
+            send_message(call->session->tox, call->friend_number, &out_msg);
 #endif
         }
         break;