ZyXEL Communications PRESTIGE 2000W V2, User Manual

Page: 102 / 131

P-2000W_V2 User’s Guide
102 Chapter 13 Administrator Web Configurator Screens
Table 20 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 of a buffer could
introduce a significant delay with a slow connection. Too small of a buffer may
result in packets being lost.
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 VoIP service
provider’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.