LevelOne VOI-8001 - Manual (Page 65)

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 RFC2833: Payload number for DTMF[96~127]:
Define the DTMF token on RFC2833, input range form 96 to 127.
 RTP Packet NAT Detect By:
User can select the packet transmit method when under the NAT network
environment, by IP (NAT 255 fake IP), or transmit by TCP port, usually
suggest select the option “By IP or By Port”.
 Extension Number SIP Header To:
Use the number in the SIP header column as the dial out number.
 Supported SIP 100rel:
The name of the option tag for the SIP extension that is supported by this
SIP protocol is 100rel, it is used for Sending Reliable Provisional Responses.
Enable this item if needed.
 RTP Packet Monitor Time [0 Disable](sec):
If set 60 sec, when network failed over 60 seconds, device will cut this call
automatically.
 Silence Detection / Suppression:
Enable or disable the Silence Detection/VAD function. When Enable, if local
gateway detect a silence situation ( no talk), it will send a VAD package rather
than a full voice package for remote side to active CNG ( Comfort Noise
Generation) to save the bandwidth. The default is Enable to save the
bandwidth.
 Prefer CODEC :
In this table, you can define the prefer CODEC. The priority 1 selection is
highest priority. By different CODEC, user can select different payload size
per package as below:
 G.711 uLaw: 20,30,40,50,60,70,80ms
 G.711 aLaw: 20, 30,40,50,60,70,80ms
 G.723.1: 30,60,90ms
 G.729a: 20,30,40,50,60,70,80ms
 G.726: 20,30,40,50,60,70,80ms
 None: none
The gateway will calculate and show approximately bandwidth for one VoIP
call.