Using the 'required gatekeeper' setting to stop an MCU/IP VCR connecting to unregistered endpoints

Does the 'Required gatekeeper' setting stop the Cisco TelePresence MCU/IP VCR connecting to unregistered endpoints?

On the Settings > H.323 page, for H323 gatekeeper usage you can choose between Enabled, Disabled and Required.

However, this setting does not prevent the MCU/IP VCR connecting to unregistered endpoints. When the registration is set to Required the unit must get a reply from the gatekeeper before it calls out or accepts a call in. So, for example, if the gatekeeper is unavailable, when the setting is Required, the unit will not accept or make calls. If the setting is Enabled, then the unit queries the gatekeeper, but if there is no reply then it connects the call anyway.

The decision on whether to allow calls to unregistered endpoints depends on the gatekeeper. The unit asks the gatekeeper every time it makes a call out or a call is made in (if the call arrives on a port with the Ethernet port association on). If the gatekeeper tells the unit to reject the call, for instance because the endpoint is not registered, then the unit will do just that. That depends on gatekeeper settings, not on the settings on the MCU/IP VCR.

This article applies to the following products:

  • Cisco TelePresence IP VCR 2200 / MSE VCR blade
  • Cisco TelePresence MCU 4200 / MSE 8420
  • Cisco TelePresence MCU 4500
  • Cisco TelePresence MSE 8510 blade

April 30th, 2011 TAA_KB_109