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Distributed Communications System B Private Networking
Administration for Network Connectivity
CID: 77730 555-233-504 — Issue 1 — April 2000
350
Uniform Dial Plan
Uniform Dial Plan (UDP) provides a common 4- or 5-digit dial plan (specified in the
Dial Plan Record) that can be shared among a group of switches. Interswitch dialing
and intraswitch dialing both require 4- or 5-digit dialing. UDP is used with an
electronic tandem network (ETN); main, satellite, and tributary switches; and
Distributed Communications Systems (DCS). In addition, UDP can provide uniform
4- or 5-digit dialing between 2 or more private-switching systems without ETN, main,
satellite, and tributary switches, or DCS.
How to administer UDP
Note: On the Uniform Dialing Plan form, if you change the Ext Code
and Type fields from a 4-digit or 5-digit extension number to
none, a warning message informs you that all UDP extension
codes will be lost. The same warning message displays when you
change the Ext Code and Type extension numbers from 4-digits
to 5-digits or from 5-digits to 4-digits.
Detailed description UDP routes calls off the local switch by converting the extension number into a
private-network number with 7 digits. This number is formed by prepending a 3-digit
code (of the form XXX) to the (last) 4 digits of the extension number. 3 types of
conversion are supported: UDPCode, AARCode, and ENPNode.
• For UDPCode and AARCode, XXX is a 3-digit private-network location code,
and the result is analyzed and routed via Automatic Alternate Routing (AAR).
UDPCode conversion prohibits digit conversion via AAR; AARCode conversion
permits it, just as if you dialed the AAR number instead of the extension.
• For ENPCode, XXX is called an Extension Number Portability (ENP) code. It is
not used for routing; node-number routing is used instead. The ENP code is
chosen based on the first 1 or 2 digits of the dialed string. Because it is not used
for routing, the ENPCode can be independent of location.
Form Field
Dial Plan Record
Second Digit Table
• Uniform Dial Plan
• UDP Extension Search Order
Uniform Dial Plan
• All
AAR and ARS Digit Analysis Table
• All
AAR and ARS Digit Conversion
Table
• All
Node Number Routing
• Route Pat
Extension Number Portability
Numbering Plan
• All
Route Pattern
• All