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SIP
 Select Settings > SIP
Account
Account name  This is the name displayed on the screen. It can be set according 
to company standards.
User  The account (customer) name.
Password    The password used for the Realm authentication.
Registrar 1  Shall contain the IP address or the public name of the SIP server 
where the account is registered (e.g. 10.10.1.100 for a local SIP 
server or sip.company.net for a public VoIP service provider)
Registrar 2  Alternative registrar for SIP redundancy
Realm  The protection domain where the SIP authentication (name and 
password) is valid. This is usually the same as the registrar. If 
SETTINGS