FW: Using COPS for VoIP call initiation

["Gross, Gerhard" <gerhard.gross@intel.com>]

Arie,

We have implemented a COPS extension for SIP in house
which does something very similar to what you describe.
The SIP proxy (call agent) is the PEP and a policy server
is contacted for a policy based admission decision. The
policy server may base its decision on a variety of criteria.

Standards work is ongoing:
http://www.ietf.org/internet-drafts/draft-gross-cops-sip-01.txt
http://www.ietf.org/internet-drafts/draft-gross-sipaq-01.txt

Gery


> -----Original Message-----
> From: Arie Nimkovsky [mailto:animkovsky@vyyo.co.il]
> Sent: Tuesday, April 24, 2001 9:52 AM
> To: rap@ops.ietf.org
> Subject: Using COPS for VoIP call initiation
> 
> 
> Hello,
> 
> Our system uses a layer-2 (bridge) entity through which VoIP 
> calls flow.
> This bridge should supply resources relevant to VoIP. 
> A Call Agent which manages the call signaling will inform the 
> bridge about
> the required resources for each call, and the bridge will 
> reply the Call
> Agent whether it has the requested resources. If it has not - the call
> request be dropped by the Call Agent.
> My question:
> Is COPS suitable for such message exchange?  Who is the 
> client and who is
> the server in this case? It seems to me that the 
> client/server roles are
> reversed here - the entity that knows about the call in 
> progress is the Call
> Agent so it is the candidate for the client (PEP) role, 
> however the actual
> admission will make the bridge, so from this aspect IT should 
> be the policy
> enforcing point.
> Can someone to enlighten me on this? If not COPS - may be 
> there is some
> other more suitable protocol for the stated purposes?
> 
> Thanks,
> Arie Nimkovsky
> 
> 
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