Cisco Systems 5.x manual Design Considerations, Amis Bridgehead Configuration

Chapter 5 AMIS Networking

AMIS Concepts and Definitions

Figure 5-1 AMIS Bridgehead Configuration

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	UAmis_Unity2 mailbox

Unity 1 Unity 2

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Voice connector

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Design Considerations

Because AMIS calls are placed and answered on the Cisco Unity server on which the AMIS delivery locations were created, you can configure your Cisco Unity servers as needed to handle AMIS traffic.

•You can set up a bridgehead topology by designating one Cisco Unity server in the network to handle sending and receiving AMIS calls. See Figure 5-1.

•Recall that the dialout for an outbound AMIS message originates from the Cisco Unity server on which an AMIS delivery location was created. If the AMIS traffic is too heavy for one Cisco Unity server to handle, you can balance the load by setting up multiple AMIS bridgehead servers. In this case, you need to determine which AMIS delivery locations and AMIS subscribers to create on each of the Cisco Unity servers, and keep a record of the mapping.

For example, assume that there are two AMIS bridgehead servers, Bridgehead A and Bridgehead B, and there are four AMIS delivery locations called London, Paris, Goose Creek, and Monks Corner. You anticipate that message delivery to the London and Paris delivery locations will be heavy, and that message delivery to the Goose Creek and Monks Corner delivery locations will not be as heavy. You can balance the load by creating the London and Goose Creek delivery locations on Bridgehead A, and create the Paris and Monks Corner delivery locations on Bridgehead B. This ensures that the AMIS traffic for the two heavy AMIS locations is split up between the two bridgehead servers, rather than one trying to deliver all of the messages by itself.

•For organizations with Cisco Unity servers deployed in different areas around the country or the world, it may be possible to set up a least-cost-routing topology to minimize or eliminate long distance phone charges related to AMIS transmissions.

For example, assume there are Cisco Unity servers in Chicago and in New York, and that there is also another voice messaging system in New York to which subscribers in Chicago want to send messages. To avoid long distance phone charges when subscribers in Chicago send messages to

	Networking Guide for Cisco Unity Release 5.x (With Microsoft Exchange)
OL-13844-01		5-39