Cisco Cisco TelePresence Video Communication Server Expressway 관리 매뉴얼
Registration Refresh
The H.323 Time to live setting controls the frequency of H.323 endpoint registration refresh. The refresh frequency
increases when the time to live is decreased. When you have many H.323 endpoints, be careful not to set the TTL too
low, because a flood of registration requests will unnecessarily impact the VCS performance.
increases when the time to live is decreased. When you have many H.323 endpoints, be careful not to set the TTL too
low, because a flood of registration requests will unnecessarily impact the VCS performance.
Configuring H.323
The configurable options are:
Field
Description
Usage tips
H.323 mode Enables or disables H.323 on
the VCS. H.323 support is On
by default.
by default.
You must enable H.323 mode if you are clustering the VCS, even if
there are no H.323 endpoints in your deployment.
there are no H.323 endpoints in your deployment.
Registration
UDP port
UDP port
The listening port for H.323
UDP registrations. Default is
1719.
UDP registrations. Default is
1719.
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.
can use H.323 services out of the box without having to first set
these up.
Registration
conflict
mode
conflict
mode
Determines how the system
behaves if an endpoint
attempts to register an alias
currently registered from
another IP address.
behaves if an endpoint
attempts to register an alias
currently registered from
another IP address.
Reject: denies the new
registration. This is the
default.
registration. This is the
default.
Overwrite: deletes the original
registration and replaces it
with the new registration.
registration and replaces it
with the new registration.
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:
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
register using the same alias.
register using the same alias.
■
A single endpoint has previously registered using a particular
alias. The IP address allocated to the endpoint then changes,
and the endpoint attempts to re-register using the same
alias.
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.
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.
registration requests are received by the same peer.
Call
signaling
TCP port
signaling
TCP port
The listening port for H.323
call signaling. Default is 1720.
call signaling. Default is 1720.
Call
signaling
signaling
port range
start and
start and
end
Specifies the lower port in the
range used by H.323 calls
after they are established.
Default is 15000.
range used by H.323 calls
after they are established.
Default is 15000.
The call signaling port range must be great enough to support all the
required concurrent calls.
required concurrent calls.
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Cisco TelePresence Video Communication Server Administrator Guide
Protocols