BYE sip:131.107.155.12:7210 SIP/2.0
Via: SIP/2.0/UDP 195.37.77.100:5090;branch=z9hG4bK62b7.43cbeb64.0
To: "qhuai" <sip:QHUAI-LAP>;tag=754bc9430a0145d09e5821109b5e171c
From: <sip:mstest@iptel.org>;tag=00005CC80F31CECC
CSeq: 2 BYE
Call-ID: ef4832152f944621847e3bf729fd4c27@131.107.155.12
Content-Length: 0
User-Agent: Sip EXpress router(0.8.11pre28 (i386/linux))
Route: <sip:mstest@195.37.77.101;ftag=754bc9430a0145d09e5821109b5e171c;lr=on>