Cisco TelePresence Administrator's Manual page 80

Video communication server
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Field
Description
H.323 mode Enables or disables H.323 on
the VCS. H.323 support is On
by default
Registration
The listening port for H.323
UDP port
UDP registrations. Default is
1719.
Call
The listening port for H.323 call
signaling
signaling. Default is 1720.
TCP port
Call
Specifies the lower port in the
signaling
range used by H.323 calls after
port range
they are established. Default is
start and
15000.
end
Registration
Determines how the system
conflict
behaves if an endpoint
mode
attempts to register an alias
currently registered from
another IP address.
Reject: denies the new
registration. This is the default.
Overwrite: deletes the original
registration and replaces it
with the new registration.
Time to live
The interval (in seconds) at
which an H.323 endpoint must
re-register with the VCS in
order to confirm that it is still
functioning. Default is 1800.
Call time to
The interval (in seconds) at
live
which the VCS polls the
endpoints in a call to verify that
they are still in the call. Default
is 120.
Auto
Determines whether it will
discover
respond to
Gatekeeper
Discovery Requests
endpoints. The default is On.
Caller ID
Specifies whether the prefix of
the ISDN gateway is inserted
into the caller's E.164 number
presented on the destination
endpoint.
Cisco VCS Administrator Guide (X7.2)
Usage tips
The default VCS configuration uses standard port numbers so
you can use H.323 services out of the box without having to first
set these up.
The call signaling port range must be great enough to support all
the required concurrent calls.
An H.323 endpoint may attempt to register with the VCS using
an alias that has already been registered on the VCS from
another IP address. The reasons for this could include:
Two endpoints at different IP addresses are attempting to
n
register using the same alias.
A single endpoint has previously registered using a particular
n
alias. The IP address allocated to the endpoint then changes,
and the endpoint attempts to re-register using the same alias.
Reject is useful if your priority is to prevent two users registering
with the same alias. Overwrite is useful if your network is such
that endpoints are often allocated new IP addresses, because it
will prevent unwanted registration rejections.
Note that in a cluster a registration conflict is only detected if the
registration requests are received by the same peer.
Some older endpoints do not support the ability to periodically re-
register with the system. In this case, and in any other situation
where the system has not had a confirmation from the endpoint
within the specified period, it will send an IRQ to the endpoint to
verify that it is still functioning.
If the endpoint does not respond, the call will be disconnected.
The system polls endpoints in a call regardless of whether the
call type is traversal or non-traversal.
To prevent H.323 endpoints being able to register automatically
with the VCS, set Auto discover to Off. This means that
sent out by
endpoints can only register with the VCS if their Gatekeeper
Discovery setting is Manual and they have been configured with
the VCS's IP address.
Including the prefix allows the recipient to directly return the call.
Protocols
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