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Registration Period: The registration will expire after Registration period,
the IP phone will re-register automatically within registration period.
SIP Server 2:
To display and configure Secondary SIP server settings.
This is for redundancy, if registering to Primary SIP server fails, the IP
phone will go to Secondary SIP server for registering.
Note:
Secondary SIP server is used for redundancy, it can be left blank if
there is not redundancy SIP server in user’s environment.