[SIPForum-discussion] SIP User List

[WIGNELL, CLIFFORD (CLIFFORD)]

Hello Tomasz,

I don't know of a mechanism for a UA to query the Registrar; but....

A couple of comments, one SIP UA does not really need to know the
Registration status of another, SIP and in this case more importantly
the SIP servers will handle the Registered/Unregistered case; in fact
there are a number of features built in to many SIP Telephony
Application Servers which handle the unregister subscriber, for example
the terminating feature Forward on not registered.

Now, what I guess you are getting at, the UA having knowledge of the
Status of a particular subscriber (i.e. UA) so that the user can choose
the best communications mechanism then this is best served by Presence.

Presence because of its group based Opt In/Out nature is better suited
to what I think you want to do. Rather than just querying the
registration status; which I think would get out of hand, the registrar
built in to the product the company I work for may store millions of
subscribers that would be unmanageable as a simple query. 

Keep on Sipping!

___________________________
Cliff Wignell


-----Original Message-----
From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of Tomasz
Zieleniewski
Sent: Sunday, 12 April 2009 6:13 PM
To: Mahammed F Eessa
Cc: discussion at sipforum.org
Subject: Re: [SIPForum-discussion] SIP User List

Hi,

SIP UA cann't it self ask the network about list of users, but
kowing a specific aor he can subscribe to the reg event package for
this aor (assuming that there is such service available in the network)
after which for the subscribtion time it would be notified about any
changes
in the registration state for contacts addresses associated to this aor.

Kind regards
- Tomasz Zieleniewski

2009/4/11 Mahammed F Eessa <mohammadfaiz2003 at yahoo.com>:
> Hi all,
> can anyone tell me how can the SIP UA get the user list of the other
users
> how are already connecting to the SIP server ?. actually, I need to
know is
> there such thing or not . and if there is no such thing how SIP can
handle
> this issue.
>
>
> Thanks in advance
>
>
>
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