• On the System Parameters Media Gateway Automatic Recovery Rule screen, set the Migrate H.248 MG to primary: field to immediately. When you administer this option, the media gateway registers with the main server to test the network stability.

  For more information on recovery rules, see Recovery to the main server.

• Use the Split Registration Prevention feature described in this section.

If you prefer aggregation at the survivable server, the main server or the survivable server disables the network regions associated with the survivable server. This causes all the telephones and gateways in the regions to register with the survivable server. The telephones and gateways cannot reregister to the main server or the survivable server till one of the following conditions is satisfied:

• At least one gateway reaches the time configured in time-day-window.

• The administrator runs the mg-return command.

• Re-registration to the main server or the survivable server ends in the following situations:

  • The survivable server becomes inactive.

  • One hour elapses after the administrator runs the enable-mg return command.

  • The administrator runs the disable mg-return command.

• The survivable server deregisters from the main server or the survivable server.