Shuffling

G700 Media Gateways implement call shuffling, a routing procedure designed to reduce Digital Signal Processor load, to reduce required IP bandwidth, and to save TDM time-slot resources. When a call is shuffled, a connection between two IP endpoints is rerouted for maximum efficiency. Without shuffling, a call is transmitted from its origination point over the IP infrastructure, through the TDM bus, and back over the IP infrastructure to its destination. With shuffling, a call passes directly from origination to destination, without passing through the TDM bus. In some instances, shuffling may require that a call passing directly from IP endpoint to IP endpoint be routed back through the TDM bus. Shuffling reduces the number of media conversion ports required and, by reducing the number of transcodings, may improve voice quality.

The end user does not have to take any action to invoke audio shuffling. The G700 will shuffle, if necessary, after a point-to-point call is established between two voice endpoints and if both endpoints are capable of handling shuffling. If the endpoints take some actions that require a tone played in the connection, the G700 will reroute the call back through the TDM bus.

The following conditions must be met for call shuffling between IP endpoints:

• Both IP endpoints must be administered to allow shuffling.
• A point-to-point voice connection must exist between two endpoints and no active call (in-use or held) exists on either endpoint which requires TDM connectivity (such as applying tones, announcement, or conferencing).
• The endpoints must be in the same LAN region or in interconnected LAN regions.
• The inter-region connection management rules must be met.
• There is at least one codec in common between the codec lists of the endpoints involved and the Internetwork region Connection Management codec list.
• The endpoints must have at least one codec in common as shown in their current codec negotiations between the endpoint and the switch.

For information on administering call shuffling, see "Administration for Network Connectivity for Avaya MultiVantage^TM Software, 555-233-504".