> 2.1.1 | Making an emergency call

> This section comprises the subsections:

> • | 2.1.1.1 Description

> • | 2.1.1.2 Used AT commands

> • | 2.1.1.3 Flow chart

> • | 2.1.1.4 Hints

> • | 2.1.1.5 Example

> 2.1.1.1 | Description

> This chapter describes the AT commands used to make an emergency call. The emergency number for GSM 900/1800 frequency bands is 112, in GSM 850/1900 networks 911 and 08 are available. The availability of emergency numbers depends on the type of ME and the services offered according to national regulations. Siemens tri-band GSM/GPRS modules support all three numbers.

> 2.1.1.2 | Used AT commands

> Command | Explanation
> ATD<number>; | Make an emergency call
> ATH | Disconnect existing connection

> For further details about the commands see [2].

> 2.1.1.3 | Flow chart

> Figure 3: Making an emergency call

> 2.1.1.4 | Hints

> GCF-C note: When designing an application ensure that the following requirements be satisfied, even if no SIM card is inserted: The mobile must be able to dial emergency numbers and to activate the audio path. This ability shall be limited only to the emergency call numbers listed in Section 2.1.

> 2.1.1.5 | Example

> ***************************************
> Comment: Making an emergency call
> ***************************************
> ***************************************
> Comment: Call 112
> ***************************************
> Subscr 1 Send:ATD112;
> Subscr 1 Receive:ATD112;
> Subscr 1 Receive:
> Subscr 1 Receive:OK
> ***************************************
> Comment: Hang up
> ***************************************
> Subscr 1 Send:ATH
> Subscr 1 Receive:ATH
> Subscr 1 Receive:OK
> ***************************************
> Comment: Dialing an emergency number not supported by the network
> ***************************************
> Subscr 1 Send:ATD911;
> Subscr 1 Receive:ATD911;
> Subscr 1 Receive: +CME ERROR: operation temporary not allowed