FS-4824 --resolve

src/mod/endpoints/mod_sofia/sofia.c

@@ -4813,7 +4813,7 @@ static void sofia_handle_sip_r_invite(switch_core_session_t *session, int status
 			switch_channel_set_variable(channel, "sip_hangup_disposition", "recv_refuse");
 		}
 
-		if (status >= 500 && sip->sip_reason && sip->sip_reason->re_protocol && (!strcasecmp(sip->sip_reason->re_protocol, "Q.850")
+		if (status >= 400 && sip->sip_reason && sip->sip_reason->re_protocol && (!strcasecmp(sip->sip_reason->re_protocol, "Q.850")
 				|| !strcasecmp(sip->sip_reason->re_protocol, "FreeSWITCH")
 				|| !strcasecmp(sip->sip_reason->re_protocol, profile->username)) && sip->sip_reason->re_cause) {
       			tech_pvt->q850_cause = atoi(sip->sip_reason->re_cause);