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The H.323 Service interacts with Unified ICME through the Unified CVP Call Server to relay
call arrival, disconnect, and transfer instructions between Unified ICME and the other H.323
endpoints.

Note: The H.323 Service is only used in H.323-based call flows.

The H.323 Service includes its own internal Voice Browser that serves several key roles in the
Unified CVP architecture. It:

•

Functions as the initial VoIP end-point for H.323 voice contacts.

•

Coordinates the delivery of messages and prompts to a caller from the Media Server.

Note: This is legacy functionality, only; it should not be used for new deployments. New
deployments should always use the Unified CVP Comprehensive call flow model, where
prompts are rendered from the IOS VXML gateway.

•

Sends HTTP requests to the IVR Service.

In addition, The H.323 Service includes a configuration and administration tool—called
VBAdmin.

On the incoming call side, the H.323 Service processes call and control signals from calls
entering the system at one of the supported ingress H.323 endpoints. (The ingress H.323 endpoints
converts them into H.323 messages before forwarding them to the H.323 Service.)

Once in control of the call, the H.323 Service converts the voice signals into events to be
processed by a web server known as the Call Server, which houses the IVR Service. The H.323
Service connects to the IVR Service through a pre-defined URL address. (For more information,
see the "

 section.")

The H.323 Service remains in the call control path until the call’s logical completion. (The IVR
Service never directly controls a telephone call.)

On its outgoing side, the H.323 Service acts upon VoiceXML commands received from the
IVR Service. The VoiceXML commands contain instructions for:

•

Transferring the telephone call.

•

Disconnecting the telephone call.

•

Delivering recorded messages and prompts and processing user responses to the prompts.

How Does the H.323 Service Connect to a Call Server?

The H.323 Service needs to find a Call Server to which to send requests to; Unified CVP
installation sets the default Call Server address to 

.

Configuration and Administration Guide for Cisco Unified Customer Voice Portal Release 4.1(1)