#
U 10.5.10.1:1103 -> 10.0.2.1:5060
  REGISTER sip:orau.gov SIP/2.0..Via: SIP/2.0/UDP 10.5.10.1:9516..From: <sip:
  morriss@orau.gov>;tag=8cf3a912-a64c-4f43-9972-a3d3c2de49f3..To: <sip:morris
  s@orau.gov>..Call-ID: 0d208a44-bbf5-4e0b-8ba1-3e58b773275e@10.5.10.1..CSeq:
   1 REGISTER..Contact: <sip:10.5.10.1:9516>;methods="INVITE, MESSAGE, INFO,
  SUBSCRIBE, OPTIONS, BYE, CANCEL, NOTIFY, ACK"..User-Agent: Windows RTC/1.0.
  .Expires: 1200..Event: registration..Allow-Events: presence..Content-Length
  : 0....
#
I 10.0.2.1 -> 10.5.10.1 3:3
  ....E..........].........O.....#REGISTER sip:orau.gov SIP/2.0..Via: SIP/2.0
  /UDP 10.5.10.1:9516..From: <sip:morriss@orau.gov>;tag=8cf3a912-a64c-4f43-99
  72-a3d3c2de49f3..To: <sip:morriss@orau.gov>..Call-ID: 0d208a44-bbf5-4e0b-8b
  a1-3e58b773275e@10.5.10.1..CSeq: 1 REGISTER..Contact: <sip:10.5.10.1:9516>;
  methods="INVITE, MESSAGE, INFO, SUBSCRIBE, OPTIONS, BYE, CANCEL, NOTIFY, AC
  K"..User-Agent: Windows RTC/1.0..Expires: 1200..Event: registration..Allow-
  Events: presence..Content-Length: 0....
#
U 10.5.10.1:1103 -> 10.0.2.1:5060
  SUBSCRIBE sip:coxt@orau.gov SIP/2.0..Via: SIP/2.0/UDP 10.5.10.1:9516..From:
   "morriss" <sip:morriss@orau.gov>;tag=44022e90-a37f-4d96-a22a-51956ebce19a.
  .To: <sip:coxt@orau.gov>..Call-ID: 27ac63b3-bed7-43ad-a9c1-949e24c55b21@10.
  5.10.1..CSeq: 1 SUBSCRIBE..Contact: <sip:10.5.10.1:9516>..User-Agent: Windo
  ws RTC/1.0..Expires: 1800..Content-Length: 0....
#
I 10.0.2.1 -> 10.5.10.1 3:3
  ....E..x.................O...d..SUBSCRIBE sip:coxt@orau.gov SIP/2.0..Via: S
  IP/2.0/UDP 10.5.10.1:9516..From: "morriss" <sip:morriss@orau.gov>;tag=44022
  e90-a37f-4d96-a22a-51956ebce19a..To: <sip:coxt@orau.gov>..Call-ID: 27ac63b3
  -bed7-43ad-a9c1-949e24c55b21@10.5.10.1..CSeq: 1 SUBSCRIBE..Contact: <sip:10
  .5.10.1:9516>..User-Agent: Windows RTC/1.0..Expires: 1800..Content-Length:
  0....