FS-3951 --resolve

src/mod/endpoints/mod_sofia/mod_sofia.c

@@ -2551,6 +2551,7 @@ static switch_status_t sofia_receive_message(switch_core_session_t *session, swi
 		break;
 	case SWITCH_MESSAGE_INDICATE_DEFLECT:
 		{
+			char *extra_headers = sofia_glue_get_extra_headers(channel, SOFIA_SIP_HEADER_PREFIX);
 			char ref_to[1024] = "";
 			const char *var;
 
@@ -2560,7 +2561,9 @@ static switch_status_t sofia_receive_message(switch_core_session_t *session, swi
 			} else {
 				switch_set_string(ref_to, msg->string_arg);
 			}
-			nua_refer(tech_pvt->nh, SIPTAG_REFER_TO_STR(ref_to), SIPTAG_REFERRED_BY_STR(tech_pvt->contact_url), TAG_END());
+			nua_refer(tech_pvt->nh, SIPTAG_REFER_TO_STR(ref_to), SIPTAG_REFERRED_BY_STR(tech_pvt->contact_url),
+						TAG_IF(!zstr(extra_headers), SIPTAG_HEADER_STR(extra_headers)),
+						TAG_END());
 			switch_mutex_unlock(tech_pvt->sofia_mutex);
 			sofia_wait_for_reply(tech_pvt, 9999, 10);
 			switch_mutex_lock(tech_pvt->sofia_mutex);