Was the SIP message on a TCP port where another process was listening?
I think that a SIP message sent to any TCP port should show up in sngrep, so if you have a webserver, etc. listening then the full packet flow might look like this: remote_host:12345 web_server:80 === TCP SYN ===> <=== TCP SYN/ACK === === TCP ACK ===> === SIP INVITE ===> **SHOWS in sngrep** <=== TCP ACK === <=== 400 Bad Request === **NOT in sngrep** Regards, Ben Kaufman
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