Cisco Cisco TelePresence Video Communication Server Expressway 관리 매뉴얼
Dial Plan and Call Processing
This section provides information about the pages that appear under the Calls, Dial plan, Transforms and Call Policy
sub-menus of the Configuration menu. These pages are used to configure the way in which the VCS receives and
processes calls.
sub-menus of the Configuration menu. These pages are used to configure the way in which the VCS receives and
processes calls.
Call Routing Process
One of the functions of the VCS is to route calls to their appropriate destination. It does this by processing incoming
search requests in order to locate the given target alias. These search requests are received from:
search requests in order to locate the given target alias. These search requests are received from:
■
locally registered endpoints
■
neighboring systems, including neighbors, traversal clients and traversal servers
■
endpoints on the public internet
There are a number of steps involved in determining the destination of a call, and some of these steps can involve
transforming the alias or redirecting the call to other aliases.
transforming the alias or redirecting the call to other aliases.
an alias is transformed from its original format to a different format, and then back to the original alias. The VCS is
able to detect circular references. If it identifies one it will terminate that branch of the search and return a “policy
loop detected” error message.
able to detect circular references. If it identifies one it will terminate that branch of the search and return a “policy
loop detected” error message.
How the VCS determines the destination of a call
The process followed by the VCS when attempting to locate a destination endpoint is described below.
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