Avaya SIP Software 3.2 for 1200 Series Manual de usuario descargar pdf (Pagina 165)

Chapter 17: Emergency Services

Overview

You can use the Avaya 1200 Series IP Deskphone to make an emergency call to the Public

Safety Answering Point (PSAP), from any screen, without a user logon. When you connect to

the PSAP, the IP Deskphone conveys the caller's location information to the PSAP. If you are

not logged on to the IP Deskphone and you pick up the handset or press the handsfree or

headset button, the message "Emergency calls only" appears on the screen of the

IP Deskphone.

If you hang up before the connection is established, the IP Deskphone goes back to the initial

state. After the connection is established, the call can only be ended by the Public Safety

Answering Point (PSAP). If you hang up, the IP Deskphone switches to loudspeaker. If the

IP Deskphone is already on the loudspeaker mode, and you press the hang up button, nothing

happens. The call is still connected and can only be disconnected by the emergency

operator.

Emergency calls originate on the IP Deskphone and are completed by the Call Server. The

Call Server communicates with the emergency network or emergency systems for routing, call

control, and location information. Although the IP Deskphone allows the user to enter location

information, this location information is not used by all Call Servers. Some Call Servers derive

the location information based on the number and location databases. Characteristics of

emergency calls and limitations of emergency calls using the IP Deskphone are as follows:

• Making calls without logging on is only allowed for emergency calls (according to the

defined dialing plan).

• Transmission of the location information depends on M5T SIP Stack version 4.1 (because

it must be able to transmit multiple MIME types).

Location information

Effective Emergency services also rely on accurate location information. The IP Deskphone

supports the inclusion of the x-nt-location header in SIP messages that provide location

information to a Avaya Call Server. The location information is selected by the user during

registration, and must be correctly provisioned at the Call Server level (see appropriate NTP

specific to your Call Server).

SIP Software for Avaya 1200 Series IP Deskphones-Administration January 2012 165

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Avaya SIP Software 3.2 for 1200 Series Manual de usuario Pagina 165