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Field name Explanation
Register Expire
Time
Set expire time of SIP server register, default is 60 seconds. If the
register time of the server requested is longer or shorter than the expire
time set, the phone will change automatically the time into the time
recommended by the server, and register again.
NAT Keep Alive
Interval
Set examining interval of the server, default is 60 seconds.
User Agent Set the user agent if have, the default is VoIP Phone 1.0.
Signal Key Set the key for signal encryption.
Media Key Set the key for RTP encryption.
Local port Set sip port of each line.
Ring type Set ring type of each line.
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