Chapter 19: 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).
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).
March 2015 SIP Software for Avaya 1200 Series IP Deskphones-Administration 217
Comments? infodev@avaya.com
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