比如这样的
4 a X5 c; B. y$ {6 J7 _. M# D2 u" |8 X+ f
- p& d9 Z: \; Q! C; }. [OPTIONS sip:nm SIP/2.01 Y5 m8 \; P2 o L% H
Via: SIP/2.0/TCP nm;branch=foo
6 i* k8 f+ S* [ t1 n; kFrom: <sip:nm@nm>;tag=root
. ?) G8 R; O9 H5 p) kTo: <sip:nm2@nm2>) H* r" n) g" K0 _* ]; m, v
Call-ID: 50000
* P8 ~1 h5 f4 F9 p' p8 ACSeq: 42 OPTIONS- q* ?# u2 F) \# A( s8 V, o
Max-Forwards: 70% _( i8 X! _ m7 J; y
Content-Length: 0* D( S( k, j" q$ V5 o1 w
Contact: <sip:nm@nm>
& P5 k: a5 j/ p6 u3 U4 s/ SAccept: application/sdp/ g. S: A! a$ d3 ~4 c+ S
5 ^+ y7 B6 I) O0 `$ _
- k* o4 j# t: X
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