比如这样的
) q6 x/ m+ r" s# q& v A
5 x5 C6 ]) c5 u/ j% `* e5 m
6 f! a r" P, Y" qOPTIONS sip:nm SIP/2.0
% R1 W- `9 w" PVia: SIP/2.0/TCP nm;branch=foo) L+ Q/ m/ q: h- q6 }
From: <sip:nm@nm>;tag=root d# f2 c) b; Y5 B: ~4 c
To: <sip:nm2@nm2>
6 v$ j" o$ A w9 _' GCall-ID: 500004 J3 w$ N. ~6 ~0 w
CSeq: 42 OPTIONS
. F. _! T# W+ X* uMax-Forwards: 70
8 ?! y6 o8 t0 ?Content-Length: 0' Y! \) G+ Y4 G' n q! M8 v
Contact: <sip:nm@nm>$ }. h: X( _- J
Accept: application/sdp( a0 L' [# {5 D/ R X, n5 c
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