If the Branch Gateway contains an MM710 T1/E1 media module, it is advisable to define the MM710 as the primary synchronization source for the Branch Gateway. In so doing, clock synchronization signals from the Central Office (CO) are used by the MM710 to synchronize all operations of the Branch Gateway. ISDN BRI trunks Media Modules (MM721, MM722) can also use signals from the Central Office, to synchronize all operations of the Branch Gateway.

Where traditional synchronization is not available, you can use Clock Synchronization over IP (CSoIP). CSoIP to provide timing information across IP networks. CSoIP is also needed to support TDM-based devices, such as an H.320 video device, that customers would retain and transmit within an IP infrastructure. Use the CM SAT Administration forms to administer Synchronization over IP.

The relevant screens are the following:

• change system features to enable the synchronization over the IP feature

• change media gateway <n> to enable synchronization over IP for the gateway.

• change synchronization media-gateway <n> to configure synchronization sources on the gateway