Draytek Vigor2100 - Manual (Page 27)

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The detail explanation of the SIP and Port settings window:
SIP Port Set the port number for sending/receiving SIP message for building
a session. The default value is 5060. Your peer must set the same
value in his/her Registrar.
Registrar Set the domain name or IP address of the SIP Registrar server.
Proxy Set domain name or IP address of SIP proxy server. If this setting
value is the same as Registrar, please press “Duplicate”.
Domain/Realm Set the domain name or IP address field of SIP Address. e.g., every
text after @. If this setting value is the same as Registrar, please
press “Duplicate”.
Use Registrar With the Registrar domain entered above, tick this box to let the
Vigor2100 series use the SIP Registrar.
Display Name The “caller-ID” that you want to be displayed on your friend’s screen.
Account
Name Enter your account name of SIP Address, e.g. every text before @.
Authorization
User Enter the name or number used for SIP Authorization with SIP
Registrar. If this setting value is the same as Account Name, please
press “Duplicate”.
Password The password provided to you when you registered with a SIP
service.
Expire Time The time duration that your SIP Registrar server keeps your
registration record. Before the time expires the Vigor2100 series will
send another register request to SIP Registrar again.