Aastra Telecom 41-001343-02 manual Defining an Emergency Dial Plan, Limitation

Operational Features

Defining an Emergency Dial Plan

Public telephone networks in countries around the world have a single emergency telephone number (emergency serv- ices number), that allows a caller to contact local emergency services for assistance when required. The emergency tele- phone number may differ from country to country. It is typically a three-digit number so that it can be easily remem- bered and dialed quickly. Some countries have a different emergency number for each of the different emergency serv- ices.

You can specify the digits to dial on the IP phone for contacting emergency services. Once you specify the emergency number(s) on the phone, you can dial those numbers directly on the dial pad when required and the phone automati- cally dials to those emergency services.

Note:

Contact your local phone service provider for available emergency numbers in your area.

The following table describes the default emergency numbers on the IP phones.

Emergency Number	Description
911	A United States emergency number
999	A United Kingdom emergency number
112	An international emergency telephone number for GSM mobile phone networks.
	In all European Union countries it is also the emergency telephone number for both mobile and fixed-line tele-
	phones.
110	A police and/or fire emergency number in Asia, Europe, Middle East, and South America.

Emergency Dial Plan and Pattern Matching

The IP Phones support emergency dialing using pattern matching and prepend dial plan functionality.

There are two ways to dial a number on the phone:

•dialing digit-by-digit (i.e., select line and dial)

•dialing by string (i.e., pre-dial then go off-hook)

When a user dials digit-by-digit, the phone adds every digit to a dialed string and checks against the dial plan. If the phone is not locked, it checks against the regular dial plan. If the phone is locked, it checks against the emergency dial plan.

When a user dials by string, (pre-dial, speed-dial, etc., and then goes off-hook), and the phone is not locked, it checks to see if the number matches the emergency dial plan. If it doesn’t match, it blocks the call from going through. If the phone is locked, and the number matches the emergency dial plan it allows the call to go through.

Adding a prepend to a dial plan also works with both dialing digit-by-digit and dialing by string.

Limitation

The following is a limitation for emergency dial plans with pattern matching:

•Secondary dial tone is not supported.

You can set the emergency dial plan via the configuration files or the Aastra Web UI.

Configuring an Emergency Dial Plan

Use the following procedures to specify the numbers to use on your phone for dialing emergency services in your area.

Configuration Files

For specific parameters you can set in the configuration files, see Appendix A, the section, “Emergency Dial Plan Settings” on page A-15.

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