# Introduction

If an emergency call is made to one of the public emergency numbers, the communication server adds to the call set up additional information of the geographic location of the caller, so that the provider is able to route the call to the correct PSAP (Public safety answering point). Depending on the country and the provider, not all types of network interfaces (SIP, ISDN, analogue) are supported.

## Making an emergency call

General behaviour of the system:

- A user dials a number, which is stored in the list of public emergency numbers.

- The system detects that an emergency call is made by comparing the dialled number against the configured list of public emergency numbers.

- Once it is clear that the call is an emergency call, the system determines the exact location of the caller, following the different configured options (see Determining the location of the caller).

- The system selects a line of the configured route for this emergency location, fills in the emergency location id sends it to the provider.

- In parallel the emergency response team is informed, e-mails and event messages are sent and logs are updated (see Informing the emergency response team).

Parent topic: Function codes and services
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