Referring to section "3.1.2 Successful SIP to SIP
through two proxies"...
1. User Agent B gets an INVITE from Proxy 2
(only request URI, Routes and Record-routes shown):
F7 INVITE Proxy 2 -> B
INVITE sip:[EMAIL PROTECTED] SIP/2.0
Record-Route: <sip:[EMAIL PROTECTED];maddr=ss2.wcom.com>,
<sip:[EMAIL PROTECTED];maddr=ss1.wcom.com>
2. User Agent B then sends ringing:
F9 180 Ringing B -> Proxy 2
SIP/2.0 180 Ringing
(no record-route because I think this call-flow doc
is out-of-date)
3. User Agent B sends OK:
F12 200 OK B -> Proxy 2
SIP/2.0 200 OK
Record-Route: <sip:[EMAIL PROTECTED];maddr=ss2.wcom.com>,
<sip:[EMAIL PROTECTED];maddr=ss1.wcom.com>
4. ACK from proxy:
F17 ACK Proxy 2 -> B
ACK sip:[EMAIL PROTECTED] SIP/2.0
(no record-route)
5. B then hangs up
F18 BYE User B -> Proxy 2
BYE sip:[EMAIL PROTECTED] SIP/2.0
Route: <sip:[EMAIL PROTECTED];maddr=ss1.wcom.com>,
<sip:[EMAIL PROTECTED]>
Could someone tell me where it says in RFC2543 bis-09
that you should insert the remote contact?
And where is the route
for <sip:[EMAIL PROTECTED];maddr=ss2.wcom.com>??
Are these simply old behaviours based on an old draft?
The examples used in the newest draft,
RFC2543 bis-09 (section "16.12.1 Examples")
do not insert the remote contact into the route
and they do not seem to remove any routes.
Would I be right in saying that, for bis-09, the route
processing is much simpler?
To me it seems that if a UA receives an INVITE
with Record-Route:1,2,3,4 (I realise 1,2,3,4 are illegal
route entries but it's just to make a point) then ALL
responses to this INVITE should use Record-Route:1,2,3,4.
e.g.
proxy User-agent
---INVITE Record-Route:1,2,3,4------->
<--180 ringing Record-Route:1,2,3,4---
<--200 OK Record-Route:1,2,3,4---
---ACK------------------------------->
Then when the UA wants to hangup:
<--BYE Route:1,2,3,4----------
---OK-------------------------------->
Is my understanding correct?
Any help is appreciated.
Regards,
Attila
Attila Sipos
Software Engineer
<mailto:[EMAIL PROTECTED]>
<http://www.vegastream.com>
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