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6.14 STUN&UPnP Settings – NAT Keep Alive Time Settings
Always send keepalive packet
KeepAlive Time
6.15 Audio Setting & QoS
Codec
RTP Packet Size
VAD
DTMF Transmission
Audio Priority TOS
Enable or disable to send keepalive packet always.
The time interval that the IP phone always sends the keepalive packet in
order to ensure NAT works properly.
Voice Compression Algorithm priority settings. Select from the most used
codec to the least used codec.
Real-Time Transfer Protocol (RTP) packet length.
Enable or disable VAD.
Select the tone method for IP phone.
Sets the type of service (Layer 3) for this Internet datagram.
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