Hi All, Can someone checks why, in the situation of a client that cancels a call before the destination send a "180 ringing" to the proxy, that causes some troble to the proxy because it is not forwarding the cancel to the destination. See the following 2 examples : In this situation the cancel works fine: 651.327850 10.112.128.220 -> 10.112.128.247 SIP/SDP Request: INVITE sip:testef03@teste.pt, with session description 651.328725 10.112.128.247 -> 10.112.128.220 SIP Status: 100 trying -- your call is important to us 651.328778 10.112.128.247 -> 10.112.128.187 SIP/SDP Request: INVITE sip:testef03@10.112.128.187:7678, with session description 651.576892 10.112.128.187 -> 10.112.128.247 SIP Status: 180 Ringing 651.577005 10.112.128.247 -> 10.112.128.220 SIP Status: 180 Ringing 651.722172 10.112.128.220 -> 10.112.128.247 SIP Request: CANCEL sip:testef03@teste.pt 651.723047 10.112.128.247 -> 10.112.128.187 SIP Request: CANCEL sip:testef03@10.112.128.187:7678 651.723084 10.112.128.247 -> 10.112.128.220 SIP Status: 200 cancelling 651.723622 10.112.128.247 -> 10.112.128.220 SIP Status: 487 Request cancelled 651.724792 10.112.128.220 -> 10.112.128.247 SIP Request: ACK sip:testef03@teste.pt 651.899824 10.112.128.187 -> 10.112.128.247 SIP Status: 200 OK 651.900593 10.112.128.187 -> 10.112.128.247 SIP Status: 487 Request Terminated 651.900666 10.112.128.247 -> 10.112.128.187 SIP Request: ACK sip:testef03@10.112.128.187:7678 In this one, the cancel never reaches the destination client, so it keeps ringing... 657.866834 10.112.128.220 -> 10.112.128.247 SIP/SDP Request: INVITE sip:testef03@teste.pt, with session description 657.867667 10.112.128.247 -> 10.112.128.220 SIP Status: 100 trying -- your call is important to us 657.867720 10.112.128.247 -> 10.112.128.187 SIP/SDP Request: INVITE sip:testef03@10.112.128.187:7678, with session description 658.068940 10.112.128.247 -> 10.112.128.187 SIP/SDP Request: INVITE sip:testef03@10.112.128.187:7678, with session description 658.083368 10.112.128.220 -> 10.112.128.247 SIP Request: CANCEL sip:testef03@teste.pt 658.084201 10.112.128.247 -> 10.112.128.220 SIP Status: 200 ok -- no more pending branches 658.084948 10.112.128.247 -> 10.112.128.220 SIP Status: 487 Request cancelled 658.085933 10.112.128.220 -> 10.112.128.247 SIP Request: ACK sip:testef03@teste.pt 658.228348 10.112.128.187 -> 10.112.128.247 SIP Status: 180 Ringing 658.232010 10.112.128.187 -> 10.112.128.247 SIP Status: 180 Ringing Thanks, Toni