3130IF -VoIP User Manual V1.2
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Configure IP address of SIP STUN server;
Configure port of SIP STUN.
STUN can support SIP terminal's penetration to NAT in the inner-net. In this
way, as long as there is conventional SIP proxy and a STUN server placed in
the public net, it will do; but STUN only supports three NAT modes: FULL
CONE, restricted, port restricted;
Public backup server configuration; the specific configuration parameter has
the same meaning with public server. It should be noted that the username and
password should be the same with the public main server;
Private server configuration. specific configuration parameter has the same
meaning with public server;