feat(sip): Added auto-knocking for sip gateway if lobby is enabled

Co-authored-by: Gabriel Imre <gabriel.lucaci@8x8.com>

react/features/lobby/middleware.js

 import { MiddlewareRegistry, StateListenerRegistry } from '../base/redux';
 import { isTestModeEnabled } from '../base/testing';
 import { NOTIFICATION_TYPE, showNotification } from '../notifications';
-import { isPrejoinPageEnabled } from '../prejoin/functions';
+import { shouldAutoKnock } from '../prejoin/functions';
 
 import { KNOCKING_PARTICIPANT_ARRIVED_OR_UPDATED } from './actionTypes';
 import {
 
         dispatch(openLobbyScreen());
 
-        if (isPrejoinPageEnabled(state) && !state['features/lobby'].knocking) {
-            // prejoin is enabled, so we knock automatically
+        if (shouldAutoKnock(state)) {
             dispatch(startKnocking());
         }
 

react/features/prejoin/functions.js

 export function isPrejoinPageVisible(state: Object): boolean {
     return isPrejoinPageEnabled(state) && state['features/prejoin']?.showPrejoin;
 }
+
+/**
+ * Returns true if we should auto-knock in case lobby is enabled for the room.
+ *
+ * @param {Object} state - The state of the app.
+ * @returns {boolean}
+ */
+export function shouldAutoKnock(state: Object): boolean {
+    const { iAmRecorder, iAmSipGateway } = state['features/base/config'];
+
+    return (isPrejoinPageEnabled(state) || (iAmRecorder && iAmSipGateway))
+        && !state['features/lobby'].knocking;
+}