Split registrations occur when resources in one network region are registered with different servers. Split registrations occur when a system malfunction activates survivable servers, telephones register with the main server, and gateways register with the survivable server. The survivable server is a survivable remote server (SRS) or a survivable core server (SCS). The telephones registered with the main server are isolated from the trunk and VoIP resources.

With the split registration prevention feature, an administrator can administer telephones and gateways to register with the main server or the survivable server.

The main server ensures that all the gateways and telephones in a network region register with the same server. The gateways and telephones can register with the survivable server or with the main server after the main server is restored. Administrators can configure telephones and gateways to register with active survivable servers. The split registration prevention feature keeps branch-oriented operations intact with local trunk and VoIP resources.