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STUN NAT Transverse：STUN NAT Transverse status true or false.
STUN Server Addr: configure stun server address.
STUN Server Port: configure stun server port default 3478.
STUN Effect Time: stun detect NAT type interval time .If NAT found a link
inactive for a certain time , it will close the link so you need to send a
packet within a interval tome to keep the link alive.
Local SIP Port: config local SIP port, default as 5060.
Use Stun：enable/disable SIP STUN.
Attention： SIP STUN is used for NAT transverse. When you config
o
STUN server's address and port (default 3478) and enable it, then
you can use the normal SIP server to make the IP phone transverse
NAT.
No Answer Time: no answer call forward time setting.
No Disturb: DND, do not disturb, when there is an incoming call , the caller
will get the message that this line is not available , but you it has no
affection when you make outgoing call.
Ban Outgoing: Enable this to ban outgoing calls.
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