Reliably Transmitting (no NAT) to 10.19.20.229:5060:
INVITE sip:6286@pbxproxy:0 SIP/2.0
Via: SIP/2.0/UDP 127.0.0.1:5060;branch=z9hG4bK78575329; rport
Max-Forwards: 70
From: "Matthew Nicholson" <sip:ekiga@127.0.0.1>;tag=as739af1ff
To: <sip:6286@pbxproxy:0>
Contact: <sip:ekiga@127.0.0.1>
Call-ID: 60df610f7292f3fc444140ca0030e2b3@127.0.0.1
CSeq: 102 INVITE
User-Agent: Asterisk PBX SVN-trunk-r126903
Date: Thu, 03 Jul 2008 18:08:51 GMT
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces, timer
Content-Type: application/sdp
Content-Length: 312

v=0
o=root 224341039 224341039 IN IP4 127.0.0.1
s=Asterisk PBX SVN-trunk-r126903
c=IN IP4 127.0.0.1
t=0 0
m=audio 19782 RTP/AVP 0 3 8 101
a=rtpmap:0 PCMU/8000
a=rtpmap:3 GSM/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -
a=ptime:20
a=sendrecv

---