sipgrep was created by Alexandr Dubovikov
It is a wrapper on ngrep which
* filters SIP messages according number in To or From header fields
* displays From tag, To tag, Call-ID and branch in
different colours, thus it is possible to trace dialogs or transactions
by "one look into message" ... this is really great! ;-)
* It can store received messages into a file and show them (together)
Known "issues":
* you might need to change "path to ngrep", for example I changed it to
$ngrep="sudo ngrep -d any";
which runs ngrep on all interfaces under sudo for me
[ README written by Vaclav ]