Cisco TelePresence Video Communication Server Administrator's Manual page 299

Reference material
H323 Gatekeeper CallSignaling PortRange Start: <1024..65534>
Specifies the lower port in the range to be used by calls once they are established.
Default: 15000
Example: xConfiguration H323 Gatekeeper CallSignaling PortRange Start: 15000
H323 Gatekeeper CallSignaling TCP Port: <1024..65534>
Specifies the port that listens for H.323 call signaling.
Default: 1720
Example: xConfiguration H323 Gatekeeper CallSignaling TCP Port: 1720
H323 Gatekeeper CallTimeToLive: <60..65534>
Specifies the interval (in seconds) at which the VCS polls the endpoints in a call to verify that they are still in the
call.
Default: 120
Example: xConfiguration H323 Gatekeeper CallTimeToLive: 120
H323 Gatekeeper Registration ConflictMode: <Reject/Overwrite>
Determines how the system will behave if an endpoint attempts to register an alias currently registered from
another IP address.
Reject: denies the registration.
Overwrite: deletes the original registration and replaces it with the new registration.
Default: Reject
Example: xConfiguration H323 Gatekeeper Registration ConflictMode: Reject
H323 Gatekeeper Registration UDP Port: <1024..65534>
Specifies the port to be used for H.323 UDP registrations.
Default: 1719
Example: xConfiguration H323 Gatekeeper Registration UDP Port: 1719
H323 Gatekeeper TimeToLive: <60..65534>
Specifies 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: 1800
Example: xConfiguration H323 Gatekeeper TimeToLive: 1800
Cisco VCS Administrator Guide (X6.1) Page 299 of 401