[SIPForum-discussion] SIP gatekeepers

Irwin Lazar ilazar at burtongroup.com
Tue Apr 11 13:24:12 UTC 2006

I had a question about the use of a gatekeeper during migration from an
H.323 to a SIP environment.  The scenario is a global enterprise with over
100,000 users, hundreds of thousands of customers, and multiple call centers
around the world.  Currently in-bound calls enter via globally distributed
H.323 gatekeepers which control how calls are routed (e.g. Routing based on
phone number and available resources).

In migrating to a SIP environment the challenge is how to preserve this
gatekeeper-like functionality.  Basic requirements include support for both
H.323 & SIP, ability to do source & destination-based call routing, ability
to support RSVP, dynamic gatekeeper configuration, and routed-mode call
routing, again with a very large volume of incoming and outgoing calls.

Are there products out there that can meet this need?  From what I¹ve seen
in examining products from leading enterprise VoIP vendors, their SIP
gateways lack certain features and can¹t scale to the size necessary for
this installation.  Would SBC products be able to do these sorts of things?

Thanks in advance,

Irwin Lazar, CISSP
Senior Analyst, Burton Group
ilazar at burtongroup.com
Phone: 703-742-9659
AIM/Gizmo/Google/MSN/Skype/Yahoo: imlazar
Sightspeed: ilazar at burtongorup.com

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