INVITE sip:bob@[3ffe:1200:3012:c006:206:5bff:fe55:462f] SIP/2.0
Via: SIP/2.0/UDP [3ffe:1200:3012:c000:0030:e0ff:fe40:6297]:5062
     ;branch=z9hG4bKuNCTHs8Lumv
     ;received=3ffe:1200:3012:c006:0030:e0ff:fe40:6297
Via: SIP/2.0/UDP [3ffe:1200:3012:c000:210:a4ff:fe8d:6a46]:5062
     ;branch=z9hG4bKuNCTHs8Lumv
     ;received=[3ffe:1200:3012:c006:210:a4ff:fe8d:6a46]
From: <sip:alice@[3ffe:1200:3012:c000:210:a4ff:fe8d:6a46]>
     ;tag=ud6a29947
To: <sip:bob@example.com;maddr=[3ffe:1200:3012:c006:206:5bff:fe55:462f]>
Call-ID: f89fa68e-5109-11d6-0581-0010A48D6A46
CSeq: 2 INVITE
Contact: <sip:[3ffe:1200:3012:c000:210:a4ff:fe8d:6a46]:5062>
Call-Info: <http://[3ffe:1200:3012:c000:210:a4ff:fe8d:6a46]/alice.gif>
     ;purpose=icon;g-param=[3ffe:1200:3012:c000:210:a4ff:fe8d:6a46]
Content-Type: application/sdp
Content-Length: 239

v=0
o=alice 1804289383 2 IN IP6 3ffe:1200:3012:c000:210:a4ff:fe8d:6a46
s=-
c=IN IP6 3ffe:1200:3012:c000:210:a4ff:fe8d:6a46
t=0 0
m=audio 5004 RTP/AVP 96 97 98
a=rtpmap:96 AMR/8000
a=rtpmap:97 AMR-WB/16000
a=rtpmap:98 GSM-EFR/8000