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

Thu May 3 04:56:20 UTC 2007

Hello Srinivasa

Comments are inline.

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 2:55:05 PM
Subject: RE: [SIPForum-discussion] Issue in Initiation/Termination of call   withDe-Registered User

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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.

<Santosh> What does it mean by Charging depends on Policies of Proxy server? Do you mean that If Un-registered user is able to call then Proxy can charge to others?

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.

  <Santosh> Here I am bit confused, How BYE from B to A and INVITE Flow from A to B is same?
Can you please explain?
Because as per my understanding When De-registered A initiates INVITE to Registered B, Proxy will look for B's address but in case BYE from B to A, I believe proxy will look for A's address which one is de-registered user....Right?

[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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