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Allowed / Disallowed Lists Feature

Description

Star Codes and Allowed/Disallowed Lists

A star code is a central office code used to perform a specific function, such as *70 to disable Call Waiting. In some instances, after you dial a star code, the central office provides a second dial tone as a prompt to enter more digits. Generally, this second dial tone is immediate. In cases when the second dial tone is delayed, however, system dialing restrictions can be circumvented.

The System Manager can enter the star digit (*) in Allowed List and Disallowed List entries. The system can also be programmed with a delay period (see Second Dial Tone Timer), during which no dialing is allowed while the central office dial tone returns. If dialing is attempted, the call is treated as though it had violated calling restrictions and is not completed.

The star codes that the system recognizes are as follows:

• 2-digit codes: *(00-19, 40-99)
• 3-digit codes: *(200-399)

Restrictions are reset after leading star codes. This means that any star codes that are not included in an Allowed or Disallowed List are not considered. The digits that follow the star code are then compared again to the lists. If a caller dials *67280, the Allowed/Disallowed List feature acts as though 280 were dialed. In this case, star codes do not need to be placed in an Allowed or Disallowed List to restrict calls to specific exchanges or area codes.

The programmed delay is also activated when, you dial the rotary telephone equivalent of a star code is dialed (for example, 1170). Multiple leading star codes (such as *67*70) are also handled by the system because the dialed number is checked against Allowed and Disallowed Lists after each star code is detected.

The following examples show how to set table entries to achieve specific results:

• Disallow calls preceded by *67, but allow all other calls:
  Enter *67 as a Disallowed List entry.
• Disallow calls preceded by all star codes, but allow all other calls:
  Enter * as a Disallowed List entry.
• Disallow calls preceded by *67 or *69, but allow all other calls:
  Enter *67 as a Disallowed List entry, and enter *69 as a separate entry.
• Disallow calls preceded by *67, calls to 900 numbers and 411, but allow all other calls:
  Enter *67, 900, and 411 as separate Disallowed List entries.

The following examples identify specific results that cannot be achieved through programming the system:

• Disallow *67 when dialing a specific exchange.
• Disallow *67 only when it is followed by *69.

Topics
	Description
	Star Codes and Allowed / Disallowed Lists Default Disallowed Lists Disallowed Lists and VMI Ports Wild Card for Allowed Lists
	At a Glance
	Considerations & Constraints
	System Programming
	Feature Interactions