比如这样的+ F, |; R" ~% o7 Y3 t0 U
6 p; U0 \; J. o8 \* r; ]) C4 `5 g
7 I. B: k0 z! E1 q I0 j7 f. pOPTIONS sip:nm SIP/2.0
7 [: S# ~* o+ O7 k, g( g# {Via: SIP/2.0/TCP nm;branch=foo
" d4 @- W( t g. OFrom: <sip:nm@nm>;tag=root. X. |" y2 P3 q" \% q6 h
To: <sip:nm2@nm2>
4 G6 B& c9 U2 A! {, U5 Y# JCall-ID: 50000
7 p% N# [5 N- V. v- H0 qCSeq: 42 OPTIONS v9 U) j& j+ R8 N4 Z# S y
Max-Forwards: 70" _( l0 V% j) R# G
Content-Length: 0
: Q3 w- b. t: w KContact: <sip:nm@nm>
' s. R P# f J4 ~+ ^Accept: application/sdp
5 f; f0 v" p4 z, U& W/ U( u- W9 U% N
5 i i7 C% P/ R5 d! ?; A
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