I am implementing TLS transport from the PJSIP library and ran over a via header problem while trying to register to Freeswitch server. >From the debug output on the freeswitch box I see: "nta: Via check: invalid transport "SIP/2.0/tls" from 192.168.1.12:37842" Where 192.168.1.12 is from the the softphone that is implementing PJSIP. Digging into the freeswitch source code, I saw that this message was coming from libs/sofia-sip/libsofia-sip-ua/nta/nta.c where they do "[...]!su_strmatch(v->v_protocol, tpv->v_protocol)", and su_strmatch is a wrapper over strcmp. It turns out that "SIP/2.0/tls" (pjsip) is compared with "SIP/2.0/TLS" (sofia) and strcmp being case sensitive, the match fails. I tried to look in RFC3261 to see what was said about that but I couldn't find it exactly. I'm pretty sure that PJSIP is doing it right and that the via header should be processed in a case-insensitive way.
