比如这样的9 I* `! o6 B, p& w& O4 z
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& G8 C( _. Y0 P' |* ]% F8 r6 X) dOPTIONS sip:nm SIP/2.07 u% ~+ Z2 B; \! N- @
Via: SIP/2.0/TCP nm;branch=foo0 b4 f& g% \' p2 o/ |
From: <sip:nm@nm>;tag=root
, J" m! R, c* F. y6 ATo: <sip:nm2@nm2>, }* ]) u% L; R+ T3 b \, ?
Call-ID: 50000
8 T* `; U6 j+ |. t' G1 R- }9 ]( XCSeq: 42 OPTIONS
# ?5 }" K# L, W) q6 w3 mMax-Forwards: 70
9 V) N& s ^, AContent-Length: 0
0 W% K0 s3 }" T- u) aContact: <sip:nm@nm>9 I5 i! W) a. {. C u" @
Accept: application/sdp2 X+ r9 Y0 _/ p5 i
( E$ w$ g; {1 ]. o, A6 g# C2 U
! q7 c d& X$ R# o( \
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