Something

U 10.211.55.2:5002 -> 10.0.0.1:5060
REGISTER sip:vorpalcloud.org SIP/2.0.
CSeq: 9 REGISTER.
Via: SIP/2.0/UDP 10.211.55.2:5002;branch=z9hG4bK66b522de-38be-db11-8df0-f0ed0a1e4fe9;rport.
User-Agent: XMeeting/0.3.4.
From: <sip:storm@vorpalcloud.org>;tag=02b022de-38be-db11-8df0-f0ed0a1e4fe9.
Call-ID: aabe461d-38be-db11-8df0-f0ed0a1e4fe9@ecco.vorpalcloud.org.
To: <sip:storm@vorpalcloud.org>.
Contact: <sip:storm@10.211.55.2:5002;transport=udp>.
Allow: INVITE,ACK,OPTIONS,BYE,CANCEL,NOTIFY,REFER,MESSAGE,INFO,PING.
Expires: 3600.
Content-Length: 0.
Max-Forwards: 70.

lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
        inet6 ::1 prefixlen 128 
        inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1 
        inet 127.0.0.1 netmask 0xff000000 
gif0: flags=8010<POINTOPOINT,MULTICAST> mtu 1280
stf0: flags=0<> mtu 1280
en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        ether 00:16:cb:98:09:11 
        media: autoselect status: inactive
        supported media: autoselect 10baseT/UTP <half-duplex> 10baseT/UTP <full-duplex> 10baseT/UTP <full-duplex,hw-loopback> 10baseT/UTP <full-duplex,flow-control> 100baseTX <half-duplex> 100baseTX <full-duplex> 100baseTX <full-duplex,hw-loopback> 100baseTX <full-duplex,flow-control> 1000baseT <full-duplex> 1000baseT <full-duplex,hw-loopback> 1000baseT <full-duplex,flow-control> none
en1: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        inet6 fe80::217:f2ff:fe43:4539%en1 prefixlen 64 scopeid 0x5 
        inet 10.0.0.20 netmask 0xffffff00 broadcast 10.0.0.255
        ether 00:17:f2:43:45:39 
        media: autoselect status: active
        supported media: autoselect
wlt1: flags=41<UP,RUNNING> mtu 1500
fw0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 2030
        lladdr 00:16:cb:ff:fe:63:0e:c2 
        media: autoselect <full-duplex> status: inactive
        supported media: autoselect <full-duplex>
en2: flags=8963<UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
        inet6 fe80::201:23ff:fe45:6789%en2 prefixlen 64 scopeid 0x8 
        inet 10.37.129.2 netmask 0xffffff00 broadcast 10.37.129.255
        ether 00:01:23:45:67:89 
        media: autoselect status: active
        supported media: autoselect
en3: flags=8963<UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
        inet6 fe80::210:32ff:fe54:7698%en3 prefixlen 64 scopeid 0x9 
        inet 10.211.55.2 netmask 0xffffff00 broadcast 10.211.55.255
        ether 00:10:32:54:76:98 
        media: autoselect status: active
        supported media: autoselect