User guide

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send register message out, the FXS line still can use SIP trunk
for VOIP call or call locally.
 TEL No: The registrar telephone number
 User ID: The SIP user ID for register and call making
 User Password: The SIP password for register and call making
 Display Name: The SIP display name
 Internal: When it is set to internal, Dynamix 2522 does not