Enable Group by selecting it, then the phone enable
the sip group backup function
Notice: the deployment will become effective in all
sip lines
Registration Failure
Retry Time
Specify the registration failure retry time, if the
phone register failed, the phone will register again
after registration failure retry time.
Notice: the deployment will become effective in all
sip lines.
8.3.3.2 STUN
In this web page, you can configure SIP STUN.
STUN: By STUN server, the phone in private network could know the type of
NAT and the NAT mapping IP and port of SIP. The phone might register itself to
SIP server with global IP and port to realize the device both calling and being
called in private network.
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