- add new SIP.Realm auth mode (upstream r8146)
- remove qop element from REGISTER because proxies may try to reauth if it is present
- make sure SRES is always 8 characters in length, fixes periodic registration failures when leading zeros are present
(upstream r8155)
- make sure all RTP ports are unsigned
- prevents totally bogus SDP offers from being made due to conversion kabooms (m=audio 4294935774 RTP/AVP 3)
(upstream r8160)