Polycom VSX Series - Manual (Page 78)

Administrator’s Guide for the VSX Series
3 - 22
3. Select and configure these settings:
4. Select and configure these settings:
Setting Description
Line Signaling Specifies the framing format in use.
This setting is configurable for PRI E1, read-only for PRI T1.
External CSU
North America only Specifies whether this system uses an external or internal
Channel Service Unit (CSU).
Line Build Out
PRI T1 only For systems using an internal CSU, indicates the output
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
Algorithm Specifies which voice algorithm (aLaw or uLaw) is used for
ISDN voice calls.
Do not change this setting unless you experience audio
issues in all ISDN voice calls.
Setting Description
Numbering Plan Select the appropriate numbering plan for your location, if it
differs from the default.
International
Dialing Prefix Specify the dialing prefix needed for international calls.
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
Channels to Dial
in Parallel Specifies how many channels to dial at one time.
You can specify up to eight channels. If you experience
network problems, decrease the number.
Set this value to 1 for serial dialing. Serial dialing is not
recommended unless you have trouble connecting calls using
parallel dialing.
Restore Defaults Resets all values on this screen. This does not affect other
PRI settings.