Polycom VSX Series Setting Description Line Signaling, External CSU, Line Build Out, Parallel

Administrator’s Guide for the VSX Series

3.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	Specifies whether this system uses an external or internal
North America only	Channel Service Unit (CSU).
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
Algorithm	ISDN 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
in Parallel	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.

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