Zones

Zones are used for Dial Emergency calls on US systems where no E911 adjunct is installed. They are also used when a trunk to an install E911 adjunct cannot be seized or the E911 adjunct is indicating an alarm through its alarm station being off-hook (busy).

Zones allow extensions in the same location to be grouped and to have the external trunks registered to the same location associated with them. This billing address of those trunks or other information held by the trunk provider can then be used identify the correct emergency center that should respond to Dial Emergency calls from extensions in that zone.

The extension number used for this function is the Base Extension number set through the Extension | Extn tab. This allows the physical extension to be correctly identified even if currently being used by a hot desking user with a different associated extension number.

A zone named Default is maintained by the IP Office. By default all extensions and lines are included in this zone. This zone can be edited but cannot be removed. Any extension included in another zone and then removed is automatically placed back into the Default zone. Trunks can be deleted as some trunks will not be public trunks suitable for emergency calls.

•	To call an extension using its Base Extension number, the short code feature Dial Physical Extn by Number can be used. This is normally provided by the default short code 70N# when N can be replaced by the required Base Extension number.

E911 System \| Zones
Control Unit	SOE , IP403 , IP406 V1 , IP406 V2 , IP412 , IP500 .
Software Level	1.0+.
Mergeable	.

This tab shows the existing E911 zones, the number of stations (extensions) and trunks in each zone and the base extension numbers of the extensions. The settings can be edited by clicking on an existing zone and selecting Edit. A new zone can be created by selecting Add.

•	Name: Default = Default, Range = Up to 15 characters. Allows a unique name to be assigned to each zone.

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Stations: Default = Contains all Extension ID's
Lists the extensions in the zone. Click Add to add and remove extensions. To just remove extensions, select the extension or extensions and click Remove. Extensions removed from any zone are automatically included in the Default zone and cannot be removed from that zone except by inclusion in another zone. Each extension can only be included in one zone.

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Trunks: Default = Blank
List the trunks associated with the zone. Click Add to add and remove trunks. To just remove trunks, select the trunk or trunks and click Remove. Each trunk can only be included in one zone. Dial emergency calls will seize the first available trunk. If no available trunk can be seized, the call will fallback to using the routing indicated with the Line Group ID of the Dial Emergency short code and final to using any available analog or digital trunk.