User's Manual

Avaya Branch Gateway Manager 10.0 Page 421
15-601011 Issue 29r (Friday, November 02, 2012)B5800 Branch Gateway
Configuration Settings: PLDS License
5.24 E911 System
This section is only for U-Law systems with their system Locale set to United States.
When the central office receives and emergency call, it routes the call to a dedicated emergency network. The
call is then distributed to the correct emergency operator using either the automatic line identification
information (ALI) received with the call or the registered billing address of the line on which the call was made.
E911 is system whereby emergency calls are routed through an E911 Adjunct which adds additional location
information to the call based on the extension making the call. The use of E911 may be mandatory in some
locations and may include the provision of an adjunct owned and managed by a third party or the central
office.
Using Dial Emergency Short Codes
On all systems, regardless of locale; system and or ARS short codes using the Dial Emergency feature should be
created for any required emergency service numbers. Those short codes should be usable by all users from all
extensions. Those short codes should route the calls to suitable lines. If the system uses prefixes for external dialing, the
dialing of emergency numbers with and without the prefix should be allowed.
The blocking of emergency calls or the rerouting of emergency calls to a intermediate destination other than the central
office may be against local and nation laws.
Emergency Dialing without an E911 Adjunct
The system E911 settings are only applicable for a system configured with an E911 Adjunct. If no adjunct is present, Dial
Emergency short codes are used as described above.
Emergency Dialing with an E911 Adjunct
An E911 adjunct is an additional piece of equipment. It holds a database of location information based on the base
extension number passed to it by the system. Connection from the system is by loop-start analog trunks. The adjunct is
then connected to the central office's 911 emergency network by CAMA (Centralized Automatic Message Accounting)
trunks.
When E911 is enabled and operating, all Dial Emergency calls are routed to the adjunct. The base extension ID is used
by the adjuncts database to add the appropriate location information to the calls ALI before passing it to the emergency
network.
· If Dial Emergency calls cannot be routed to the E911 adjunct due to congestion, the system will automatically
fallback to using the E911 Zones.
· The E911 adjunct includes an alarm switch that can be connected to a system analog extension port. Dial
Emergency calls will fallback to using E911 Zones if the E911 adjunct indicates an alarm.
If you are using E911 with an E911 Adjunct, the following needs to be administered:
1.Ensure that the appropriate Dial Emergency short codes have been configure either in system short codes or in
an ARS form.
2.On the E911 Adjunct tab select Enable.
3.In the Adjunct Trunks list select those trunks that are connected to the E911 Adjunct.
4.In the Alarm Station field, indicate the extension number of the user to which the E911 adjunct's alarm
connection has been connected.
· On an operator or security extension, a programmable button can be set to monitor the status of the Alarm
Station user. That button will then indicate in use (busy) when the E911 adjunct is in its alarm state.
5.E911 Zones should still be configured. These are used if the system cannot seize one of the Adjunct Trunks or the
Alarm Station is busy (indicating a fault with the E911 adjunct connections).
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