Hi, I'm still trying to understand that "Unable to create/find channel" problem on chan_sip, I've never seen on my other gateways. Please can anyone tell me possible reasons for "too old packets", and maybe how to avoid them! I'm using the same SIP with other asterisk gateways without problems. Thanks, Roger. full-log: Feb 2 21:06:49 DEBUG[30130]: Auto destroying call '1166476086@192.168.1.20' Feb 2 21:06:50 DEBUG[30130]: Setting NAT on RTP to 4 Feb 2 21:06:50 NOTICE[30130]: Unable to create/find channel Feb 2 21:06:50 DEBUG[30130]: Stopping retransmission on '2119409754@192.168.1.20' of Response 1331: Found Feb 2 21:06:50 DEBUG[30130]: Setting NAT on RTP to 4 Feb 2 21:06:51 DEBUG[30130]: Ignoring too old packet packet 1331 (expecting >= 1332) Feb 2 21:06:51 NOTICE[30130]: Unable to create/find channel