Re: [Sip] SIP Dialog Match

["T Satyanarayana-A12694" <satyanarayana.t at motorola.com>]

No, this isn't how it usually works. For call forwarding, there is
usually a proxy (or a softswitch) which does it on behalf of B.

However, if B chooses to do it himself: C (forwardee) gets it like a
regular call from B (forwarding agent) and C doesn't reply to A - it
replies to B. B then can shuffle the calls so that the call is directly
between A and C (through a set of target refreshes). However, this is
just hypothetical and not usually done in reality.

Regards
Satya T

-----Original Message-----
From: sip-bounces at ietf.org [mailto:sip-bounces at ietf.org] On Behalf Of
Karunesh Sharma
Sent: Monday, August 03, 2009 9:29 PM
To: Dale Worley
Cc: sip at ietf.org
Subject: Re: [Sip] SIP Dialog Match

Is this a valid behavior for scenario like 'Call-Forwarding'?

K$
_______________________


-----Original Message-----
From: Karunesh Sharma
Sent: Monday, August 03, 2009 9:22 PM
To: 'Dale Worley'
Cc: aayush bhatnagar; sip at ietf.org
Subject: RE: [Sip] SIP Dialog Match

I am trying to get that info how 'C' has this dialog identifiers but I
was wondering this as a major security issue for any SIP network.

K$
_______________________


-----Original Message-----
From: Dale Worley [mailto:dworley at nortel.com]
Sent: Monday, August 03, 2009 9:17 PM
To: Karunesh Sharma
Cc: aayush bhatnagar; sip at ietf.org
Subject: RE: [Sip] SIP Dialog Match

On Mon, 2009-08-03 at 21:03 +0530, Karunesh Sharma wrote:
> 172.16.31.30 (read as 'A') sent INVITE to 10.0.4.6 (read as 'B'). But 
> somehow 192.168.4.67 (read as 'C') responds. Now 'A' knows nothing
about
> 'C', but still based on SIP dialog identifiers 'A' accepts that.
> 
> So is there any way to challenge or deny such rouge responses?

Have you inquired as to how C knows of the dialog identifiers, and why
it is sending the responses?

Dale


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