Summary
This article describes how to configure multicasting for Zone Paging on the Application Gateway.
Background
The Application Gateway can be configured to take advantage of a multicast environment when sending pages. You can enable multicasting for the Application Gateway so that it sends a page as a single packet to a multicast IP address. The packet is then distributed by the switch to multiple IP addresses.
The Application Gateway enables phones in the receiving zone to receive multicast audio packets on a specific multicast IP address. For each zone page, the Application Gateway checks out a multicast IP address from the multicast IP address pool and then checks the address back in after the page is completed.
Procedure
Enable and configure multicasting for Zone Paging from the Operation > Voice Office > IP Phone page of the Administration Tool.
Note: The Application Gateway supports a maximum of 128 IP addresses for multicasting. If the multicast range is too large, multicasting is not enabled on the Application Gateway and the system log includes the following entries:
ippool: unable to initialize IP pool
zp: unable to init ip pool
zp: turning off multicast
