Avaya S8300 - Page 2

SZ; Reviewed:
SPOC 8/10/2007
Solution & Interoperability Test Lab Application Notes
©2007 Avaya Inc. All Rights Reserved.
2 of 30
ACM-Cisco-CM-GK.doc
1. Introduction
An H.323 gatekeeper can provide address translation and network access control services for
H.323 terminals and gateways. These Application Notes present the configuration steps to allow
Avaya Communication Manager to communicate with Cisco CallManager via a Cisco 2811
Gatekeeper. These Application Notes will cover the necessary configuration steps for Avaya
Communication Manager, a Cisco 2811 Gatekeeper and Cisco CallManager.
Figure 1 depicts the network configuration utilized for these Application Notes.
In Location A in Figure 1, the Avaya G350 Media Gateway with S8300 Server provides both
H.323 Gateway (GW) and Gatekeeper (GK) functionality. In Location B, the Cisco 2811 access
router is configured as an H.323 Gatekeeper, and the Cisco CallManager is registered with it.
The Cisco 2811 GK provides E.164 to IP address resolution and call control for bandwidth
between the Location A and Location B.
The are two zones defined on this Gatekeeper, a local zone for Location B and a remote zone
for Location A. The Gatekeeper stays in Local zone. The following shows the basic flow for a
call from Location A to Location B:
• Avaya Communication Manager sends a Location Request (LRQ) message to the Cisco
2811 Gatekeeper.
• The Cisco 2811 Gatekeeper checks its dial plan and bandwidth requirement
• If the call meets the bandwidth requirement:
o The Cisco 2811 GK responds with location confirm (LCF) to Avaya
Communication Manager.
o Avaya Communication Manager will set up the call to the Cisco CallManager
through H.225 (Q.931) signaling.
• If the bandwidth requested exceeds the bandwidth requirement, the Cisco 2811
Gatekeeper sends call Location Rejection (LRJ) to Avaya Communication Manager to
deny the call.
Similarly, this call flow can be applied for call origination in Location B to Location A.