ACK sip:voip2@stateless_ip SIP/2.0 Record-Route: <sip:voip2@Bplatform_ip;ftag=368e6f71;lr=on> Via: SIP/2.0/UDP Bplatform_ip;branch=0 Via: SIP/2.0/UDP B_ip:64064;received=B_public_ip;branch=z9hG4bK-d87543-226b496c2343f701-1--d87543-;rport=2301 Max-Forwards: 69 Route: <sip:stateless_ip;lr=on> (!!!!) Route: <sip:statefull_ip;ftag=368e6f71;lr=on> (****) Route: <sip:stateless_ip;lr=on> - why did (****) Routes disappear ?