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Polycom, Inc. 288
Dialing method The ISDN inward dialing method for the site:
• DID (Direct Inward Dial). Select this option if your ISDN gateway is
provisioned with a range of phone numbers from the ISDN service provider,
and each of these numbers will be assigned to an endpoint as an alias.
• Gateway Extension Dialing. Select this option if your ISDN gateway’s
ISDN connection is provisioned with a single gateway phone number from
the ISDN service provider, and endpoints will be assigned an extension
(E.164 alias) that’s internal to the company and doesn’t correspond to any
number that can be dialed on the PSTN.
Endpoints can be dialed from the PSTN by dialing the ISDN gateway
phone number, followed by a delimiter (usually a #) and the extension
number. The gateway receives the full number from the PSTN and
dials only the extension number on the IP network.
ISDN Outbound Dialing
Override ITU dialing rules Check this box to override the standard dialing rules, established by the
International Telecommunications Union, when dialing out using an ISDN
gateway.
The default setting, which does not override ITU dialing rules, is usually
accurate for placing outbound calls. Enable this setting if you find that ISDN
gateway calls from registered endpoints in this site are unsuccessful.
PBX access code The code needed to access the ISDN/PSTN network through the site’s PBX
when dialing out.
Country code The country code for the site’s location. Click the CC button to select from a
list of countries.
To apply ITU dialing rules, the system must compare the country code of the
gateway site with the country code of the call’s destination.
Area code The city or area code for the site’s location. Leading zeroes are optional. For
example, the city code for Paris is 01, but you can enter either 01 or 1 in this
field.
To apply ITU dialing rules, the system must compare the area code of the
gateway site with the area code of the call’s destination.
Always dial area code Specifies that the area code should always be included in the phone number.
Always dial national prefix Specifies that the national prefix should always be included in the phone
number.
Length of subscriber
number
The number of digits in a phone number. For example, in the United States
and other areas using the North American Numbering Plan (NANP),
subscriber numbers have seven digits.
ISDN Range Assignment (for DID dialing method)
Length of call line identifier The number of digits in the Call Line Identifier (CLID), which is the dialed
number. The maximum is 17.
For example, in the United States, the number of digits in the CLID is often 7
for outside local calls and 11 for callers in a different area code.
Field Description