Enabling Vad; Configuring Vofr Voice Bandwidth - 3Com MSR 50 Series Configuration Manual

Enabling VAD

Configuring VoFR
Voice Bandwidth
To do...
Enter system view
Enter voice view
Enter voice dial program view dial-program
Create a VoFR entity and
enter VoFR entity view
Configure a match template
for the VoFR entity
Configure the out-of-band
DTMF transmission mode
n
In the dynamic mode, the DTMF transmission mode is determined by the
■
configuration of the VoFR entity on the originating side.
In the FRF.11 trunk mode, the DTMF transmission mode is determined by the
■
configurations of the VoFR entities on the originating and terminating sides.
Follow these steps to enable the voice activity detection (VAD):
To do...
Enter system view
Enter voice view
Enter voice dial program view dial-program
Create a VoFR entity and
enter VoFR entity view
Enable VAD
You can reserve the maximum amount of voice bandwidth to control the
maximum number of calls. If the required bandwidth is not greater than the
remaining bandwidth, a new call is allowed. Otherwise, the new call is rejected.
For example, the reserved bandwidth is 64 kbps and each call requires a
bandwidth of 10 kbps, then only six calls can be set up concurrently and a seventh
call will be rejected. In the case of concurrent transmission of voice and data over
a channel, the voice bandwidth is processed in the following two ways:
A bandwidth is reserved for voice to prevent the case that the voice quality is
■
degraded because of the consumption of the whole bandwidth by burst data.
Once a call is set up successfully, the bandwidth will be exclusively occupied by
voice until the call is completed.
Voice takes precedence over data. The actual bandwidth in a call changes
■
dynamically. When no data is transmitted, the silence packets sent occupies
only a very small portion of bandwidth. This method can avoid the bandwidth
waste caused by bandwidth reservation for voice.

Configuring VoFR Voice Bandwidth

Use the command...
system-view
voice-setup
entity entity-number vofr
match-template
match-string
outband vofr
Use the command...
system-view
voice-setup
entity entity-number vofr
vad-on
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Remarks
-
-
-
-
Required
By default, no match template
is configured for the VoFR
entity.
Required
By default, the inband DTMF
transmission is configured.
Remarks
-
-
-
-
Required
Disabled by default.
Note that the G.711 codec
does not support VAD.