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====== Backup ======
Use this table to enter up to 10 additional backup SIP registrars, with which the system can register if the main PBX/server goes offline.  This is entirely optional.\\ \\ The //Order// column indicates the order in which the servers will be checked; always configure them in the desired order of precedence, starting with server 1.  For each server, enter its IP address or DNS name.\\ \\ **All backup servers must use the same port number, realm, expire time and transport protocol as the main server.**

{{:images:vs8:vsconfig:telephony-backup.png?direct|}}

^Setting^Description^
|//Default to primary on restart//|Check this box if you want the system to always attempt to register with the main server at startup.\\ \\ If unchecked, the system will default to using whichever server it last registered with.|
|//Backup ?//|IP address or DNS name of backup server.|