
31
6.14 STUN&UPnP Settings – NAT Keep Alive Time Settings
Always send keepalive packet
Enable or disable to send keepalive packet always.
KeepAlive Time
The time interval that the IP phone always sends the keepalive packet in
order to ensure NAT works properly.
6.15 Audio Setting & QoS
Codec
Voice Compression Algorithm priority settings. Select from the most used
codec to the least used codec.
RTP Packet Size
Real-Time Transfer Protocol (RTP) packet length.
VAD
Enable or disable VAD.
DTMF Transmission
Select the tone method for IP phone.
Audio Priority TOS
Sets the type of service (Layer 3) for this Internet datagram.