Changes To Dialing Codes

This article discusses changes to dialing codes in Windows XP and Windows Server 2003.

Note With Telephony API (TAPI), you can configure dialing rules for all telephony programs. If you run a TAPI-supported program before you configure dialing, the program typically prompts you for the minimum information required for dialing. To completely configure dialing rules on a computer, click Start, click Control Panel, and then double-click Phone and Modem Options. You can use these options to configure all the dialing rules.

WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.
The following registry subkey represents dialing rules for predefined countries:Each country has a separate entry in this subkey. The values refer to the international country codes (for example, USA = 1).

To modify the calling rules, you can edit the following values for all the countries:

• InternationalRule
• LongDistanceRule

For additional information about creating custom calling card rules, see Windows XP Help and Support. To do so, click Start, click Help and Support, type dialing rules in the Search box, and then press ENTER to view the topics.

Rules for Dialing

The following list describes the different dialing codes that you can use to set up the custom calling card rules.

• 0-9 Numbers to be dialed.
• ABCD Characters to be dialed (tone dialing only, used for special control on some phone systems).
• E Dial the country code.
• F Dial the area code (city code).
• G Dial the local phone number.
• H Dial the card number.
• * # Characters to be dialed (tone dialing only).
• T Subsequent numbers are to be tone dialed.
• P Subsequent numbers are to be pulse dialed.
• , Pause for a fixed time.
• ! Flash (half-second on-hook, half-second off-hook).
• W Wait for a second dial tone.
• @ Wait for quiet answer (ring-back followed by five seconds of silence).
• $ Wait for calling card prompt tone.
• ? Suspend dialing until user provides input.

You can use the following codes only in Windows XP and Windows Server 2003. These codes permit you to include configurable carrier codes as part of the dialed number.

Note Earlier versions of Windows do not have this functionality.

• L Mandatory long-distance carrier.
• M Mandatory international carrier.
• N Optional long-distance carrier.
• S Optional international carrier.