Hi, I am trying to simulate Inbound calls from UAC to Kamailio to UAS. Kamailio performs location lookup within route[LOCATION] and updates URI with the address of UAS. However, it does not add a new Record-Route. Therefore, ACK message sent by UAC is not routed by the proxy: UAC ---> (send INVITE) ---> Kamailio ---> (send INVITE) ---> UASUAS ---> (send 180) ---> Kamailio ---> (send 180) ---> UACUAS ---> (send 200) ---> Kamailio ---> (send 200) ---> UAC UAC ---> (send ACK) ---> Kamailio ???? ACK message has "Route" header with the address of Proxy. Thanks,AI S