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Setting Voice Parameters
The MI provides a menu for setting voice parameters for each phone port for the PBXgateway II. The
following parameters are covered:
•
Method (of compression)- Selectable voice compression methods reduce network bandwidth
requirements. (refer to Appendix A for more information on Bandwidth Settings)
Possible Values: ADPCM32, ADPCM24, G.729A, or G.711
•
Path – The voice path (Dynamic or Constant) that relates to the bandwith used. For more information
about this parameter, see page 131.
Possible Values: Dynamic or Constant
•
Companding -Companding standards for N. America (µLaw) and Europe (aLaw).
•
DTMF – (Avaya protocols only) The method of sending tones, that correspond to numbers pressed
on the telephone, across the network. The tones can be sent as voice (In-band), or as signals (Out-
of-band).
Possible Values: In-band or Out-of-band
•
Tx Attenuation – Attenuation decreases the signal being sent to the PBX. This can be adjusted to
decrease the amount of echo during calls. The Tx attenuation can be adjusted separately so as to not
affect the Rx audio level.
•
Rx Attenuation - This can be adjusted to decrease the amount of echo during calls. The Rx
attenuation can be adjusted separately so as to not affect the Tx audio level.
•
Silence Detection – When enabled, the Extender detects silent periods during a conversation, and
as a result sends no data during these periods. This dramatically reduces bandwidth usage, so this
parameter should be Enabled (default setting). The voice path must be set to Dynamic.
Possible Values: Enabled or Disabled
•
Jitter Delay- The amount of delay (in msec) in sending voice packets. Used to accommodate jitter
(or variable delay) in an IP network or Frame Relay circuit. If not set properly voice may sound
choppy. This value is typically set to 0 in synchronous configurations. If you are experiencing audio
problems, raise this parameter by increments and retry. However, raising this value too high may
introduce speech delays.
Possible Values: 20 to 250 milliseconds
•
Packet Size - The number of voice windows included within HDLC on an IP Packet. It generally
reduces packet loss and bandwidth needs, but it will cause some additional delay in voice delivery.
There are different ranges for each type of compression (Method parameter):
Compression
ADPCM32
ADPCM24
G.729A
G.711
•
Packet Trace - Used for debug purposes only. Enable to detect lost voice packets
Possible Values: Enabled or Disabled
PBXgateway II System Administrator's Guide
Possible Values
1 to 4
1 to 5
1 to 12
1 or 2
77
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