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Use UPnP to get external IP address.
External SIP Port
External SIP port
External Media Port
External media port
UPnP
Enable or disable universal plug and play. Some NAT supports UPnP so STUN
is not required and must be disabled
Always send keep-alive
packet
Enable or disable to keep the SIP signaling channel alive.
Keep-Alive Time
The time interval that the IP phone always sends the keep-alive packet in order
to ensure that NAT is working properly.