206 Reference
DSP VOLUME ADJUSTMENTS
The VS1 telephone system enables CO and Extension volume adjustments through the Host Adapter
Digital Signal Processor (DSP). Although the DSP has been programmed to values that should work
in most settings, there are situations (such as trunk-to-trunk transfers) that may require different
values. DSP volume adjustments are most commonly made on CO ports that handle transfers to
outside lines.
Each port (T1 or Port Expansion Unit) has two DSP settings associated with it. One setting controls
the volume level into the port (IN), and the other setting controls the volume setting out of the port
(OUT). (T1 channels do not require volume adjustments.)
The volume level of a connection through the Telecor Voice Server (TVS) is determined by adding
the volume level of each component of the connection. For example, the level heard by the
extension party on an outside CO call is the sum of the CO IN volume and the Extension Port OUT
volume. Likewise, the level heard by the outside CO party is the sum of the Extension Port IN
volume and the CO OUT volume.
Note These settings do not affect internal calls. Volume adjustments for CO calls to Auto
Attendants or Voice Mail use the set aavol[in][out]= [n] command.
The command syntax associated with DSP volume is:
dsp vol {co|ext|port} ={n} {in|out} (Where n = -12 to 12).
Sample DSP Volume Adjustments
dsp vol co =5 in Set all incoming CO volumes to 5.
dsp vol ext =-2 out Set all outgoing extension volumes to -2.
dsp vol 37 =4 in Set port 37 volume IN to 4.
dsp vol co 0 in Show the current CO IN settings.
Default Values Analog CO Port T1 CO Port Extension Port
Volume IN 0 0 0
Volume OUT 0 0 0
Note The dsp enable command enables volume adjustments and must be issued before any
dsp vol commands are recognized by the system.
DSP volume adjustments remain effective until the system is reset. To make permanent changes, see
“Adjusting DSP Volume through the Startup Command Script” below.
When making DSP adjustments, keep in mind that changing any one setting has an effect on other
settings. Things to remember:
• Increasing the Volume OUT to an extension also increases the sidetone returned from that
extension.
• Setting the Volume OUT on a CO to greater than 1 can create outbound dialing problems on
the system.
• Lowering the Volume IN from an extension reduces the background noise picked up by that
extension.
• The Volume IN from a CO controls the level at which Voice Mail is recorded on the system.
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