Prestige 2000W User’s Guide

96

Chapter 13 Administrator Web Configurator Screens

Table 19   

PHONE 

LABEL

DESCRIPTION

Default Voice Codec

A voice codec (coder/decoder) converts voice data to electrical signals 

for transmission over a network. 
Use this field to select the type of voice coder/decoder (codec) that you 

want the Prestige to use. Choosing a voice codec depends on a tradeoff 

between transmission speed, sound quality and desired bandwidth 

usage. G.711 provides higher voice quality than G.729 but requires 

64kbps of bandwidth while G.729 only requires 8kbps. The Prestige can 

only connect to other phones that use the same codec as the Prestige.
If you want to use G.711, G.711u is used mainly in North America and 

G.711a is used in most of the rest of the world.

Speaking Volume(-14~14)

Select the default  gain for the Prestige’s microphone, where –14 is the 

minimum (least sensitive) and 14 is the maximum (most responsive). 
The callee may hear an echo if you set the microphone’s volume to the 

maximum.

Listening Volume(-14~14)

Select the default speaker volume on the Prestige, where –14 is the 

minimum (quietest) and 14 is the maximum (loudest).

RTP Port

Real time Transport Protocol is used to handle voice data transfer. Use 

this field to configure the Prestige’s listening port for RTP traffic. Leave 

this field set to the defaults if you were not given a RTP port to use.

Jitter Buffer

A larger receiving buffer allows the Prestige to rearrange data packets 

that arrive in the wrong order. 
Packets are dropped if they arrive out of order and the receiving buffer 

is full.
Increasing the buffer size introduces latency. Too large and a significant 

delay could be introduced over a slow connection, too small and the 

signal may distort. 

Voice Frames per Packet

Use smaller packet sizes to reduce the number of speech frames sent 

per packet. If a small packet does not reach its destination is it less 

significant than if the packet contained many speech frames. 

DTMF Relay

Dual Tone Multi-Frequency signals are generated when you press a key 

on the Keypad and communicate information (such as telephone 

numbers) to the VoIP gateway. 

Select 

disable 

to send the DTMF digits uncompressed from the 

remaining protocols to use a compression method to match that of your 

ITSP’s.  
Select 

Inband(RFC 2833) 

to send the DTMF tones in RTP packets. 

Select 

Outband

 to send the DTMF tones in SIP messages.

DTMF Payload (0-127)

This field allows you to set the DTMF payload type. It is recommended 

to leave the default setting for this field.

APPLY

Click 

APPLY

 to save your changes without restarting the Prestige. Your 

wireless LAN, Internet and SIP settings changes do not take affect until 

you use 

RESTART

 (in the navigation panel).

CANCEL

Click 

CANCEL

 to begin configuring this screen afresh.