wait for broadcast to start when starting async hold to avoid race

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@8841 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/mod/endpoints/mod_sofia/sofia_glue.c

@@ -1917,6 +1917,7 @@ uint8_t sofia_glue_negotiate_sdp(switch_core_session_t *session, sdp_session_t *
 					switch_ivr_hold_uuid(switch_channel_get_variable(tech_pvt->channel, SWITCH_SIGNAL_BOND_VARIABLE), NULL, 0);
 				} else {
 					switch_ivr_broadcast(switch_channel_get_variable(tech_pvt->channel, SWITCH_SIGNAL_BOND_VARIABLE), stream, SMF_ECHO_ALEG | SMF_LOOP);
+					switch_channel_wait_for_flag(tech_pvt->channel, CF_BROADCAST, SWITCH_TRUE, 5000);
 				}
 			}
 		}