Polycom VSX Series Administrator's Manual page 79

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Setting Description
Line Build Out For systems using an internal CSU, indicates the output
PRI T1 only attenuation in dB. Your service provider can provide you with
these values.
For systems using an external CSU, indicates the length (in feet)
of the RJ-45 cable that connects the PRI network interface module
to the CSU.
Switch Protocol Specifies the Network switch protocol. The available choices are
determined by the system's country settings.
This setting is read-only for PRI E1, configurable for PRI T1.
ISDN Voice Specifies which voice algorithm (aLaw or uLaw) is used for ISDN
Algorithm voice calls.
Do not change this setting unless you experience audio issues in
all ISDN voice calls.
4. Select and configure these settings:
Setting Description
Numbering Plan Select the appropriate numbering plan for your location, if it differs
from the default.
International Specify the dialing prefix needed for international calls.
Dialing Prefix
Call-by-Call Specifies a code that the system sends to the telephone company
switch to request a special service, if such a code is required.
Consult your telephone service provider to determine the proper
call-by-call value.
Number of ISDN Specifies how many channels to dial at one time.
Channels to Dial
You can specify up to eight channels. If you experience network
in Parallel
problems, decrease the number.
Restore Defaults Resets all values on this screen. This does not affect other PRI
settings.
Chapter 3 - Configuring Network Use
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