[Serusers] workaround for bug in snom's RR-ing

[Jiri Kuthan]

fyi (in response to a frequently asked question "how to get snom's
buggy RR-ing working along with PRACK).

I just tried to create a workaournd to the problem (which is PRACK 
does not put Routes learned in 183). It's as easy as mangling SIP 
messages not to advertise their support for "100rel":

    if (method=="INVITE" && search("User-Agent: snom")) {
        #replace("PRACK, ", "");
        replace("100rel, ", "");
    };

-jiri


--
Jiri Kuthan            http://iptel.org/~jiri/