About The Fallback Alias - Cisco TelePresence Video Communication Server Administrator's Manual

Field Description
Calls to Determines the way in which the VCS
unknown attempts to call systems which are not
IP registered with it or one of its neighbors.
addresses
Direct: allows an endpoint to make a call
to an unknown IP address without the
VCS querying any neighbors.
The call setup would occur just as it
would if the far end were registered
directly to the local system.
Indirect: upon receiving a call to an
unknown IP address, the VCS will query
its neighbors for the remote address and
if permitted will route the call through the
neighbor.
Off: endpoints registered directly to the
VCS may only call an IP address of a
system also registered directly to that
VCS.
The default is Indirect.
Fallback The alias to which incoming calls are
alias placed for calls where the IP address or
domain name of the VCS has been given
but no callee alias has been specified.

About the fallback alias

The VCS could receive a call that is destined for it but which does not specify an alias. This could be
for one of the following reasons:
the caller has dialed the IP address of the VCS directly
n
the caller has dialed a domain name belonging to the VCS (either one of its configured SIP domains,
n
or any domain that has an SRV record that points at the IP address of the VCS), without giving an
alias as a prefix
Normally such calls would be disconnected. However, such calls will be routed to the Fallback alias
if it is specified.
Note that some endpoints do not allow users to enter an alias and an IP address to which the call
should be placed.
Example usage
You may want to configure your fallback alias to be that of your receptionist, so that all calls that do not
specify an alias are still answered personally and can then be redirected appropriately.
For example, Example Inc has the domain of example.com. The endpoint at reception has the alias
reception@example.com. They configure their VCS with a fallback alias of
reception@example.com. This means that any calls made directly to example.com (that is,
Cisco VCS Administrator Guide (X6.1)
Dial plan and call processing
Usage tips
This setting applies to the call's
destination address prior to any zone
transforms, but after any pre-search
transforms, Call Policy or User Policy
rules have been applied.
In addition to controlling calls, this setting
also determines the behavior of
provisioning and presence messages to
SIP devices, as these messages are
routed to IP addresses.
See the IP dialing section for more
information.
If no fallback alias is configured, calls that
do not specify an alias will be
disconnected. See below for more
information.
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