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

Thu May 3 04:49:22 UTC 2007

Though A has been de-registered user and A is initiating INVITE for session initiation, A can send his address in FROM header as well as in Contact also...But here Problem is When B will try to intiate BYE to A, At that time if it reoutes through stateful proxy then Proxy will try to get the address of A (TO header), But Stateful proxy couldn't get the address from Database and Bye could n't reach to A, And Call leg willl be hanging.

Santosh

----- Original Message ----
From: William Prusty <williamp at TechMahindra.com>
To: santosh patra <skp10_9559 at yahoo.co.in>; Srinivas . <nsrinivas at TechMahindra.com>; discussion at sipforum.org
Sent: Wednesday, 2 May, 2007 2:15:24 PM
Subject: RE: [SIPForum-discussion] Issue in Initiation/Termination of  callwithDe-Registered User

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Suppose session is going between A &
B. if  b wants to send BYE to A in which address it will send BYE( bcz  A don’t
possess any CONTACT header field  as it has been deregistered)

Plz answer

From:
discussion-bounces at sipforum.org [mailto:discussion-bounces at sipforum.org] On Behalf Of santosh patra

Sent: Wednesday, May 02, 2007 1:28
PM

To: Srinivas .; discussion at sipforum.org

Subject: Re: [SIPForum-discussion]
Issue in Initiation/Termination of callwithDe-Registered User

Thanks for your comments..

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

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

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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