PLANET ICF-1700 - Manual (Page 32)

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Third page Enable prack: Configure whether to support SIP-PRACK function
(mainly ring tones will be used) recommends using the default
configuration
Enable uri convert: Convert # to %23 when send URI
Enable DNS SRV: Configure whether to support RFC2782 protocol
edition.
Enable display name quote: For compatibility with server
configuration issue signaling display name in quotes to expand up.
Enable CLIR: If the caller does not agree to the called party phone
display their phone number, you can apply to the telecommunications
sector that Calling Line Identification Restriction (CLIR) business
function, you can limit the called party phone display their phone
number.
Forth page Use stun: Enable/Disable SIP STUN
Stun Server: Configure the SIP STUN server address.
Stun port: Configure the SIP STUN server port.
Backup server: Configure a backup server address. When the
primary server is not connected, the user can make calls using the
backup server communication (only when the primary server cannot
connect, the backup server before connection); When the primary
server connection, the phone will automatically switch back to the
primary server.
Backup server port: Configure the SIP backup server port.