U 139.153.254.222:2546 -> 139.153.254.50:5060
  INVITE sip:mkolberg@cs.stir.ac.uk SIP/2.0..From: sip:kom@cs.stir.ac.uk;tag=
  3c5011..To: sip:mkolberg@cs.stir.ac.uk..Call-Id: call-1046948887-20@139.153
  .254.222..Cseq: 1 INVITE..Contact: <sip:kom@139.153.254.222>..Content-Type:
   application/sdp..Content-Length: 312..Accept-Language: en..Allow: INVITE, 
  ACK, CANCEL, BYE, REFER, OPTIONS, NOTIFY, REGISTER, SUBSCRIBE..Supported: s
  ip-cc, sip-cc-01, timer, replaces..User-Agent: Pingtel/2.1.5 (VxWorks)..Dat
  e: Thu, 06 Mar 2003 11:08:07 GMT..Via: SIP/2.0/UDP 139.153.254.222....v=0..
  o=Pingtel 5 5 IN IP4 139.153.254.222..s=phone-call..c=IN IP4 139.153.254.22
  2..t=0 0..m=audio 8770 RTP/AVP 96 97 0 8 18 98..a=rtpmap:96 eg711u/8000/1..
  a=rtpmap:97 eg711a/8000/1..a=rtpmap:0 pcmu/8000/1..a=rtpmap:8 pcma/8000/1..
  a=rtpmap:18 g729/8000/1..a=fmtp:18 annexb=no..a=rtpmap:98 telephone-event/8
  000/1..                                                                    
#
U 139.153.254.50:5060 -> 139.153.254.222:5060
  SIP/2.0 100 trying -- your call is important to us..From: sip:kom@cs.stir.a
  c.uk;tag=3c5011..To: sip:mkolberg@cs.stir.ac.uk..Call-Id: call-1046948887-2
  0@139.153.254.222..Cseq: 1 INVITE..Via: SIP/2.0/UDP 139.153.254.222..Server
  : Sip EXpress router (0.8.11pre6-tcp9-tm (i386/linux))..Content-Length: 0..
  Warning: 392 139.153.254.50:5060 "Noisy feedback tells: pid=801 req_src_ip=
  139.153.254.222 req_src_port=2546 in_uri=sip:mkolberg@cs.stir.ac.uk out_uri
  =sip:mko@139.153.254.34:5060 via_cnt==1"....                               
#
U 139.153.254.50:5060 -> 139.153.254.34:5060
  INVITE sip:mko@139.153.254.34:5060 SIP/2.0..Max-Forwards: 10..From: sip:kom
  @cs.stir.ac.uk;tag=3c5011..To: sip:mkolberg@cs.stir.ac.uk..Call-Id: call-10
  46948887-20@139.153.254.222..Cseq: 1 INVITE..Contact: <sip:kom@139.153.254.
  222>..Content-Type: application/sdp..Content-Length: 312..Accept-Language: 
  en..Allow: INVITE, ACK, CANCEL, BYE, REFER, OPTIONS, NOTIFY, REGISTER, SUBS
  CRIBE..Supported: sip-cc, sip-cc-01, timer, replaces..User-Agent: Pingtel/2
  .1.5 (VxWorks)..Date: Thu, 06 Mar 2003 11:08:07 GMT..Via: SIP/2.0/UDP 139.1
  53.254.50;branch=z9hG4bKfb1.273ad54.0..Via: SIP/2.0/UDP 139.153.254.222....
  v=0..o=Pingtel 5 5 IN IP4 139.153.254.222..s=phone-call..c=IN IP4 139.153.2
  54.222..t=0 0..m=audio 8770 RTP/AVP 96 97 0 8 18 98..a=rtpmap:96 eg711u/800
  0/1..a=rtpmap:97 eg711a/8000/1..a=rtpmap:0 pcmu/8000/1..a=rtpmap:8 pcma/800
  0/1..a=rtpmap:18 g729/8000/1..a=fmtp:18 annexb=no..a=rtpmap:98 telephone-ev
  ent/8000/1..                                                               
#
U 139.153.254.34:5060 -> 139.153.254.50:5060
  SIP/2.0 400 Bad Request..Accept-Language: en..To: sip:mkolberg@cs.stir.ac.u
  k; tag=638985733799.139.153.254.34..Call-ID: call-1046948887-20@139.153.254
  .222..Supported: sip-cc, sip-cc-01, timer, replaces..Allow: INVITE, ACK, CA
  NCEL, BYE, REFER, OPTIONS, NOTIFY, REGISTER, SUBSCRIBE..Via: SIP/2.0/UDP 13
  9.153.254.50;branch=z9hG4bKfb1.273ad54.0..Via: SIP/2.0/UDP 139.153.254.222.
  .Content-Type: application/sdp..User-Agent: Pingtel/2.1.5 (VxWorks)..Max-Fo
  rwards: 10..Contact: <sip:kom@139.153.254.222>..From: sip:kom@cs.stir.ac.uk
  ;tag=3c5011..CSeq: 1 INVITE..Date: Thu, 06 Mar 2003 11:08:07 GMT..Content-L
  ength: 0....                                                               
#
U 139.153.254.50:5060 -> 139.153.254.222:5060
  SIP/2.0 400 Bad Request..Accept-Language: en..To: sip:mkolberg@cs.stir.ac.u
  k; tag=638985733799.139.153.254.34..Call-ID: call-1046948887-20@139.153.254
  .222..Supported: sip-cc, sip-cc-01, timer, replaces..Allow: INVITE, ACK, CA
  NCEL, BYE, REFER, OPTIONS, NOTIFY, REGISTER, SUBSCRIBE..Via: SIP/2.0/UDP 13
  9.153.254.222..Content-Type: application/sdp..User-Agent: Pingtel/2.1.5 (Vx
  Works)..Max-Forwards: 10..Contact: <sip:kom@139.153.254.222>..From: sip:kom
  @cs.stir.ac.uk;tag=3c5011..CSeq: 1 INVITE..Date: Thu, 06 Mar 2003 11:08:07 
  GMT..Content-Length: 0....                                                 
#
U 139.153.254.50:5060 -> 139.153.254.34:5060
  ACK sip:mko@139.153.254.34:5060 SIP/2.0..Via: SIP/2.0/UDP 139.153.254.50;br
  anch=z9hG4bKfb1.273ad54.0..From: sip:kom@cs.stir.ac.uk;tag=3c5011..Call-Id:
   call-1046948887-20@139.153.254.222..To: sip:mkolberg@cs.stir.ac.uk; tag=63
  8985733799.139.153.254.34..Cseq: 1 ACK..User-Agent: Sip EXpress router(0.8.
  11pre6-tcp9-tm (i386/linux))..Content-Length: 0....                        
#
U 139.153.254.222:2546 -> 139.153.254.50:5060
  ACK sip:mkolberg@cs.stir.ac.uk SIP/2.0..Contact: sip:kom@139.153.254.222..F
  rom: sip:kom@cs.stir.ac.uk;tag=3c5011..To: sip:mkolberg@cs.stir.ac.uk; tag=
  638985733799.139.153.254.34..Call-Id: call-1046948887-20@139.153.254.222..C
  seq: 1 ACK..Accept-Language: en..User-Agent: Pingtel/2.1.5 (VxWorks)..Date:
   Thu, 06 Mar 2003 11:08:08 GMT..Via: SIP/2.0/UDP 139.153.254.222..Content-L
  ength: 0....                                                               
#
U 139.153.254.34:5060 -> 139.153.254.50:5060
  SIP/2.0 400 Bad Request..Via: SIP/2.0/UDP 139.153.254.50;branch=z9hG4bKfb1.
  273ad54.0..From: sip:kom@cs.stir.ac.uk;tag=3c5011..CSeq: 1 ACK..Call-ID: ca
  ll-1046948887-20@139.153.254.222..To: sip:mkolberg@cs.stir.ac.uk; tag=63898
  5733799.139.153.254.34..User-Agent: Sip EXpress router(0.8.11pre6-tcp9-tm (
  i386/linux))..Content-Length: 0....                                        
