Z-Edge 64 Configuration Guide
85
7
A
DVANCED
VOICE
CONFIGURATION
This chapter details configuring advanced voice applications for the Z-Edge
64. It includes the following topics:
•
ADPCM voice compression, page 85
•
•
•
Silence suppression and comfort noise generation, page 92
ADPCM voice compression
The ITU standard G.726 specifies using an Adaptive Differential Pulse Code
Modulation (ADPCM) algorithm for voice compression. ADPCM voice
compression reduces the voice-traffic bandwidth and increases your
network’s carrying capacity. For example, ADPCM reduces a 64kbps voice
circuit to 32 kbps without a significant loss in voice quality.
To apply G.726 voice compression on the Z-Edge 64, set the
preferred-ap-index to 2 in the aal2-cid-profile for both endpoints of a voice
connection.
Modify the following parameters in the aal2-cid-profile to configure
ADPCM voice compression:
Parameter
Description
admin-status
Administrative status of the link.
Values:
up
down
Default: down
preferred-ap-index
From the aal2-audio-profile, this
index number defines the preferred
audio encoding format.
Values:
1 : used for G.711 encoding (default)
2 : used for G.726 encoding