U 91.121.205.108:5060 -> 91.121.99.16:5060
INVITE sip:41215500327@91.121.99.16 SIP/2.0.
Via: SIP/2.0/UDP 91.121.205.108:5060;branch=XXXXXXXXXXXXXXXXXXX.
From: "41215500329" <sip:41215500329@91.121.205.108>;tag=XXXXXX.
To: <sip:41215500327@91.121.99.16>.
Contact: <sip:41215500329@91.121.205.108>.
Call-ID: XXXXXXXXXXXXXXXXXXX@91.121.205.108.
CSeq: 102 INVITE.
User-Agent: Asterisk PBX.
Max-Forwards: 70.
Date: Fri, 04 Mar 2011 13:XX:XX GMT.
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY.
Supported: replaces.
Content-Type: application/sdp.
Content-Length: 389.
.
v=0.
o=root 14543 14543 IN IP4 91.121.205.108.
s=session.
c=IN IP4 91.121.205.108.
t=0 0.
m=audio 5606 RTP/AVP 0 8 18 4 111 101.
a=rtpmap:0 PCMU/8000.
a=rtpmap:8 PCMA/8000.
a=rtpmap:18 G729/8000.
a=fmtp:18 annexb=no.
a=rtpmap:4 G723/8000.
a=fmtp:4 annexa=no.
a=rtpmap:111 G726-32/8000.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-16.
a=silenceSupp:off - - - -.
a=ptime:20.
a=sendrecv.

U 91.121.99.16:5060 -> 91.121.205.108:5060
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 91.121.205.108:5060;branch=XXXXXXXXXXXXXXXXXXX.
Record-Route: <sip:91.121.99.16;ftag=XXXXXX.lr>.
From: 41215500329 <sip:41215500329@91.121.205.108>;tag=XXXXXX.
To: <sip:41215500327@91.121.99.16>;tag=XXXXXX.
Call-ID: XXXXXXXXXXXXXXXXXXX@91.121.205.108.
CSeq: 102 INVITE.
Server: Sippy.
Contact: Anonymous <sip:91.121.99.16:5061>.
Content-Length: 256.
Content-Type: application/sdp.
.
v=0.
o=Sippy 141859052 1 IN IP4 91.121.99.16.
s=-.
t=0 0.
m=audio 16438 RTP/AVP 0 101.
c=IN IP4 212.147.8.99.
a=rtpmap:0 PCMU/8000.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-15.
a=ptime:20.
a=sendrecv.
a=direction:active.
a=oldmediaip:192.168.1.199.

U 91.121.205.108:5060 -> 81.62.111.35:53894
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 192.168.1.188:5060;branch=XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX;received=81.62.111.35;rport=53894.
From: "41215500329" <sip:41215500329@astrad9.switzernet.com>;tag=XXXXXX.
To: <sip:41215500327@astrad9.switzernet.com;user=phone>;tag=XXXXXX.
Call-ID: XXXXXXXX@192_168_1_188.
CSeq: 3 INVITE.
User-Agent: Asterisk PBX.
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY.
Supported: replaces.
Contact: <sip:41215500327@91.121.205.108>.
Content-Type: application/sdp.
Content-Length: 341.
.
v=0.
o=root 14543 14543 IN IP4 91.121.205.108.
s=session.
c=IN IP4 91.121.205.108.
t=0 0.
m=audio 5528 RTP/AVP 0 8 18 2 101.
a=rtpmap:0 PCMU/8000.
a=rtpmap:8 PCMA/8000.
a=rtpmap:18 G729/8000.
a=fmtp:18 annexb=no.
a=rtpmap:2 G726-32/8000.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-16.
a=silenceSupp:off - - - -.
a=ptime:20.
a=sendrecv.