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SIP
In this menu the SIP configuration settings are located configuring the FLX UC
1000 or FLX UC 1500 with the call manager.
Registrar and Back-up registrar (if configured) are the IP addresses or server
names of the Call Manager. If configured, a Proxy address can be provided,
and an indicator whether the proxy should also be used for registration. The
VoIP realm, typically “*”, can also be provided.