Polycom VSX 3000 Administrator's Manual page 63

Setting Description
Gateway Specifies the number type users enter to call this system:
Number Type
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Number of Specifies the number of digits in the DID number.
Digits in DID
The national or regional dialing plan for your location
Number
determines the standard number of digits. For instance, the
US standard is 7 digits.
Number of Specifies the number of digits in the extension used when
Digits in Direct Inward Dial is selected.
Extension
Your organization's dial plan determines this number.
3. Select and enter a prefix or suffix for each bandwidth you want to
allow for gateway calls.
Associating prefixes and suffixes with particular bandwidths on your
gateway can optimize the use of bandwidth by your organization. Be sure
to configure the gateway to use the same prefixes and suffixes you define
for the system.
Direct Inward Dial — Users enter an internal extension to
call this system directly.
Note: If you choose this setting, you must also register
the number with the gatekeeper as an E.164 alias.
Number + Extension — Users enter the gateway number
and the system's extension to call this system.
Configuring Network Use
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