[SIPForum-discussion] Issue in Initiation/Termination of call withDe-Registered User

Wed May 2 09:25:05 UTC 2007

________________________________

From: santosh patra [mailto:skp10_9559 at yahoo.co.in] 
Sent: Wednesday, May 02, 2007 1:28 PM
To: Srinivas .; discussion at sipforum.org
Subject: Re: [SIPForum-discussion] Issue in Initiation/Termination of
call withDe-Registered User

Thanks for your comments..

How about charging/billing will work in this scenario and who will be
charged and how?

[Srinivas] It depends on policies set by the proxy server. And services
it supports.

1. If the user is registered for calling party charge service. Then the
INVITE will be authenticated by the outbound server. 

             Call will go thru only if authentication is successful.

            2. If the user is registered for called party charge service
then authentication is not necessary for outbound call.

In this case can it be possible to terminate the call from Registered
user to Un-registered User, If Yes then How?

[Srinivas] Yes call can be terminated. The flow is same as the one for
INVITE.

[Srinivas]  Hope I am not confusing you.

Santosh

----- Original Message ----
From: Srinivas . <nsrinivas at TechMahindra.com>
To: santosh patra <skp10_9559 at yahoo.co.in>; discussion at sipforum.org
Sent: Wednesday, 2 May, 2007 12:05:16 PM
Subject: RE: [SIPForum-discussion] Issue in Initiation/Termination of
call withDe-Registered User

Santhosh my comments inline.

________________________________

From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of santosh patra
Sent: Monday, April 30, 2007 8:08 PM
To: discussion at sipforum.org
Subject: [SIPForum-discussion] Issue in Initiation/Termination of call
withDe-Registered User

Hello All

I am facing problem in the following scenario...So the Scenario is,

User A and B has registered in SIP server and expire header is 4 hour
i.e. 14,600 seconds.
User A has been deregistered with Expiry:0.

case1:De-registered User A is trying to initiate a call to registered
User B and the call is getting success means User B is getting the call
and Media path has also been estabilshing, Is the call should sucessful?
If yes, then how?

[Srinivas] Call should go because in SIP registration is used for
routing incoming SIP requests (INVITE or other request messages coming
to user A).

               It has no role in authorizing outgoing request (INVITE or
other request messages going to user B).

but in Case2: when User B is trying to call De-registered user A then
call is not successful and getting 4xx error response. 

[Srinivas] Call should fail, for the incoming call proxy authorizes the
incoming call. As the user A is deregistered call will fail.

Here I am getting confused that when User A has deregistered from
Registrar then there is no information of User A in Registrar and How
User A is able to initiate a call with out registration?

[Srinivas] Proxy will take care of call setup not registrar.  If your
invite carries information of User B

But RFC-3261 doesn't talk about initiation and Termination of call after
deregistering the user.

[Srinivas] Search for key word "no role in authorizing" in section 4 of
RFC 3261.

If any RFC/standard says about such scenarios then please let me know.

Please help me on this Scenario.

Thanks in Advance
Santosh

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