Grandstream Networks GXP21 Series User Manual page 33

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Phone sub menu includes the following options:
SIP
Configures SIP Proxy, Outbound Proxy, SIP User ID, SIP Auth ID, SIP Password, SIP
Phone Transport and Audio information to register SIP account on the phone.
Call Features
Configures call forward features for Forward All, Forward Busy, Forward No Answer
and No Answer Timeout.
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