User's Manual

Chapter 18: 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, in most cases 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.
Note:
If E911_TERMINATE_ENABLE is provisioned for the IP Deskphone, then the caller can
terminate the call to emergency services even after the call is established.
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).
SIP Software for Avaya 1200 Series IP Deskphones-Administration September 2013 197