FS-4501 try this

src/mod/endpoints/mod_sofia/mod_sofia.c

@@ -2398,13 +2398,14 @@ static switch_status_t sofia_receive_message(switch_core_session_t *session, swi
 			}
 			nua_refer(tech_pvt->nh, SIPTAG_REFER_TO_STR(ref_to), SIPTAG_REFERRED_BY_STR(tech_pvt->contact_url), TAG_END());
 			switch_mutex_unlock(tech_pvt->sofia_mutex);
-			sofia_wait_for_reply(tech_pvt, 9999, 300);
+			sofia_wait_for_reply(tech_pvt, 9999, 10);
 			switch_mutex_lock(tech_pvt->sofia_mutex);
 			if ((var = switch_channel_get_variable(tech_pvt->channel, "sip_refer_reply"))) {
 				msg->string_reply = switch_core_session_strdup(session, var);
 			} else {
 				msg->string_reply = "no reply";
 			}
+			switch_channel_hangup(tech_pvt->channel, SWITCH_CAUSE_BLIND_TRANSFER);
 		}
 		break;