The BYE is ok and should be forward by the Proxy based on the Route header to 24.226.0.126:5060. My guess is that the 481 is being sent by 24.226.0.126, not the proxy. The possible reasons for this are numerous, but it hard to identify what the problem is without the complete call flow.

Cheers,
Charles

jenning zhang wrote:
Hi there,

Could some tell me what is problem with my BYE message, the proxy always
returns "481 Call Leg/Transaction Does Not Exist  "

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

INVITE sip:[EMAIL PROTECTED]:5060;user=phone;transport=udp SIP/2.0
Via: SIP/2.0/UDP
sip2.4ztech.com:5060;branch=eb2ba54e-361b5d59-15d5b31d-4fb80d8-1
Record-Route:
<sip:[EMAIL PROTECTED]:5060;maddr=sip2.4ztech.com;transport=udp>


Via: SIP/2.0/UDP 24.226.0.126:5060;received=24.226.0.126
From: <sip:[EMAIL PROTECTED]>;tag=9F8236D4-1F2E
To: <sip:[EMAIL PROTECTED]>
Date: Mon, 30 Aug 2004 23:16:40 GMT
Call-ID: [EMAIL PROTECTED]
Supported: timer,100rel
Min-SE: 1800
Cisco-Guid: 2076193368-4195422680-3218703037-761164568
User-Agent:    Cisco-SIPGateway/IOS-12.x
Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, COMET, REFER,
SUBSCRIBE, NOTIFY, INFO
CSeq: 101 INVITE
Max-Forwards: 5
Remote-Party-ID:
<sip:[EMAIL PROTECTED]>;party=calling;screen=yes;privacy=off
Timestamp: 1093907800
Contact: <sip:[EMAIL PROTECTED]:5060>
Expires: 180
Allow-Events: telephone-event
Content-Type: application/sdp
Content-Length: 247

v=0
o=CiscoSystemsSIP-GW-UserAgent 7721 7097 IN IP4 24.226.0.126
s=SIP Call
c=IN IP4 24.226.0.126
t=0 0
m=audio 18240 RTP/AVP 0 101
c=IN IP4 24.226.0.126
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=ptime:20
.
.
.
.
.

<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

BYE
sip:[EMAIL PROTECTED]:5060;transport=udp


SIP/2.0
Via: SIP/2.0/UDP 24.226.1.217:5060;branch=z9hG4bK4133B6A7
From: <sip:[EMAIL PROTECTED]>;tag=9F8236D4-1F2E
To:    <sip:[EMAIL PROTECTED]>;tag=A3F462D1-3G5E
Contact: <sip:[EMAIL PROTECTED]>
Route: <sip:[EMAIL PROTECTED]:5060>
Call-ID: [EMAIL PROTECTED]
CSeq: 102 BYE
Content-Length: 0


>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>


SIP/2.0 100 Trying
Via: SIP/2.0/UDP
24.226.1.217:5060;received=24.226.1.217;branch=z9hG4bK4133B6A7
Call-ID: [EMAIL PROTECTED]
From: <sip:[EMAIL PROTECTED]>;tag=9F8236D4-1F2E
To:    <sip:[EMAIL PROTECTED]>;tag=A3F462D1-3G5E
CSeq: 102 BYE
Content-Length: 0

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

SIP/2.0 481 Call Leg/Transaction Does Not Exist
Via: SIP/2.0/UDP
24.226.1.217:5060;received=24.226.1.217;branch=z9hG4bK4133B6A7
From: <sip:[EMAIL PROTECTED]>;tag=9F8236D4-1F2E
To:    <sip:[EMAIL PROTECTED]>;tag=A3F462D1-3G5E
Call-ID: [EMAIL PROTECTED]
CSeq: 102 BYE
Content-Length: 0



Thank you very much


Jenning Zhang


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