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List:       sip-implementors
Subject:    Re: [Sip-implementors] Registration of a massive numberof	address	-of	-record...
From:       lsabourin () interstarinc ! com
Date:       2006-01-25 19:58:15
Message-ID: 8070C09439F6224285D884C0F5580DF6013119FF () PEGASUS ! interstarinc ! com
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Here is a more detailed description of the issue:


One of our customer is using a SIP proxy with a radius server for
authentication and billing.  In their environment, most of their users are
using SIP phones that are registering/authenticating to the proxy/registrar.
Each calls are audited in the radius server.  Until now everything is
simple.  

It gets complicated when we try to include our fax server in the picture.
The fax server already have a database of users that can send faxes using
SIP/T.38.  The customer has 2 issues:

1- They would like each fax users to register/authenticate in their
proxy/registrar so that all calls can be audited in the their already
existing infrastructure.

2- They don't want to create a rule for every user in the fax database so
that all incoming calls that are intended for a fax user ar snet to the fax
server.

The customer says that for them the best solution would be that the fax
server behave as a sip user agent for each user in the database.  That would
require the fax server to register for each and every user in the fax server
database.  That way the fax server would perfectly integrate in their
environment.

I am having some concerns about that.  The number of users in the fax server
database can be huge! (Somethimes more 20000 users)
We don't want to do DOS attack on the Registrar.  The other issue is to do
registration with authentication you need a user to provide
A user name and password.  The problem is that the fax server need to work
unattended.  I don't see how we would be able to provide a password unless
we keep a copy of the password in the database, which I don't think would be
wise!!!  Does any one have any idea how to resolve that?  Is there a way for
that customer to be able to audit its calls without having us to register
every user?  Maybe using the uri of the sender (from header)?  

Another issue is that a fax server is divided in components and the
component that is taking care of the fax sending/receiving through SIP/T.38
can be replicated on different end-point to distibute load so that we can
receive/send a large amount of faxes in the same time.  Which I think would
be an issue for registration since an address-of-record would need to be
registered for each SIP/T.38 node...


Please let me let know

-----Original Message-----
From: Beith, Gordon [mailto:GBeith@empirix.com] 
Sent: Friday, December 30, 2005 5:08 PM
To: lsabourin@interstarinc.com
Subject: RE: [Sip-implementors] Registration of a massive numberof
address-of -record...

If I understand correctly, this Fax server would be a core network device,
and as such would only be required to register as a single entity.
Maybe you can try and describe your networking scenario a little more for
everyone?

-----Original Message-----
From: sip-implementors-bounces@cs.columbia.edu
[mailto:sip-implementors-bounces@cs.columbia.edu] On Behalf Of Scott
Lawrence
Sent: Friday, December 30, 2005 12:55 PM
To: lsabourin@interstarinc.com
Cc: sip-implementors@cs.columbia.edu
Subject: Re: [Sip-implementors] Registration of a massive numberof
address-of -record...

On Thu, 2005-12-22 at 10:05 -0500, lsabourin@interstarinc.com wrote:
> We are building a fax server that is SIP enabled.  We would like to 
> implement REGISTRATION.  We have some concerns about scalability.
> Since the fax server is a UAS the can map to a very large number of
users (a
> few thousands),  I am a little concerned about sending a register 
> request for every single user in our database.  I am
wondering if
> anyone had to deal with that kind of concerns before and if anyone has 
> a solution to prevent our server to do such an assault on the
registrar.

Do you mean that you want the fax server to have a database of all users for
which it might receive faxes and then register itself as a contact for each
of them?

I would suggest that there are probably better ways to handle that in the
proxy.  After all - I certainly don't want a fax server to answer a call
that's also ringing on my phone.

--
Scott Lawrence  tel:+1-781-938-5306;ext=162 or sip:slawrence@pingtel.com
  Consulting Engineer - Pingtel Corp.  http://www.pingtel.com/
  sipXpbx project coordinator - SIPfoundry http://www.sipfoundry.org/sipX



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