only use the wait_for_aleg_ack when the call is unanswered

src/mod/endpoints/mod_sofia/sofia.c

@@ -6419,9 +6419,11 @@ static void sofia_handle_sip_i_state(switch_core_session_t *session, int status,
 		break;
 	case nua_callstate_completing:
 		{
-			const char *wait_for_ack = switch_channel_get_variable(channel, "sip_wait_for_aleg_ack");
 			int send_ack = 1;
 
+			if (!switch_channel_test_flag(channel, CF_ANSWERED)) {
+				const char *wait_for_ack = switch_channel_get_variable(channel, "sip_wait_for_aleg_ack");
+				
 				if (switch_true(wait_for_ack)) {
 					switch_core_session_t *other_session;
 					
@@ -6434,6 +6436,7 @@ static void sofia_handle_sip_i_state(switch_core_session_t *session, int status,
 						switch_core_session_rwunlock(other_session);
 					}
 				}
+			}
 
 			if (r_sdp && sofia_test_flag(tech_pvt, TFLAG_3PCC_INVITE) && !sofia_test_flag(tech_pvt, TFLAG_SDP)) {
 				sofia_set_flag(tech_pvt, TFLAG_SDP);