
Polycom, Inc. 65
5
Neighbored Cisco IOS and Polycom
CMA Gatekeepers
Consider neighboring gatekeepers if you are integrating an existing Cisco
environment with an existing Polycom network. Neighbored gatekeepers
make it easier to create a common dial plan. With neighbored gatekeepers, you
can do number translation and maintain your existing environments.
In this scenario, Polycom devices use the Polycom CMA system as their
gatekeeper. The Polycom CMA system will neighbor to the Cisco IOS
gatekeeper and allow dialing between Cisco Unified Communications
Manager and the CMA H.323 domain.
In order to have a common dial-plan for Cisco Unified Communications
Manager and an H.323 network, you need to configure your gatekeeper
topology. The gatekeepers can be thought of as the “phone books“ for the
H.323 network. Any attempt to dial from any device (Cisco Unified
Communications Manager or H.323) to an H.323 based platform will first
consult with the gatekeepers on the network to establish proper addressing,
bandwidth use and call admission control before attempting the actual call.
Improper gatekeeper configuration (as well as improper network QoS) can
lead to poor video quality, and poor audio quality for already established
Cisco Unified Communications Manager IP Phone calls, or the inability to
complete calls.
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