Special planning is required for equal access calls (also called IXC or Interexchange calls), N11 calls, and Dial 0 calls from systems that are not connected to the public switched telephone network. See Tandem Switching for details.
ARS restrictions (FRLs) operate independently of dial-access-to-pool restrictions, providing greater flexibility in assigning the type of usage an extension is allowed.
The international dialing code (011) can be included in any fully programmable table. If this is done, calls beginning with 011 are routed according to the table on which 011 is entered, and not according to the Dial 0 Table.
The wild card character (Pause) cannot be used in system programming to enter area codes and/ or exchanges in ARS tables.
A non-local system�s ARS access code must not be included in the non-local dial plan. To do so would allow users to dial out of the remote networked systems, bypassing local restrictions. If you attempt to include the local system�s ARS access code in the non-local dial plan, the programming is blocked. In a network, it is recommended that all systems use the same ARS access code. For additional information, see Tandem Switching and Uniform Dial Plan features.
Calls made to the equal access code (10xxx) are always routed immediately over the main pool, whether or not they appear in other ARS tables. People who are restricted from using a particular ARS route hear a high-low error tone, indicating that the call cannot be completed.
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Special planning is required for equal access calls (also called IXC or Interexchange calls), N11 calls, and Dial 0 calls from systems that are not connected to the public switched telephone network. See Tandem Switching for details. |
Even if the local telephone company does not require it, callers must dial 1 before any 10-digit telephone number, so that ARS can determine whether a call is toll or local. If the 1 is not required by the local central office, the system may be programmed to ignore it.
Some central offices still require the prefix 1 for dialing certain exchanges. If the 1 + 7-Digit Dialing Requirements option is programmed as Within Area Code, the system expects either dial time-out or a # (end of dialing) to indicate whether a 1 + 7-digit or a 1 + 10-digit number has been dialed. (This may result in delays while the user waits for time-out.) To avoid time-out delays, 1 + 7-Digit Dialing Requirements can be programmed as Not Within Area Code, but all exchanges requiring a system-prefixed 1 must be listed in a local exchange table, and the 1 must be specified as a character to be prefixed. In this case, users must not dial the 1 before dialing those exchanges.
Area Codes 800 and 900 are treated as entries in programmable tables. They may be programmed either as area codes or as exchanges.
