Specifications

Emergency 911 Operations
ShoreTel 7.5 Administration Guide B – 9
CESID of the Specified IP Address Range – The CESID of an IP address range can also
be delivered to the service provider during outbound 911 calls. A single CESID number
is assigned to a range of IP addresses such that any IP phone that has an IP address that
falls within the specified range will have this CESID sent for outbound 911 calls. This
option works best for identifying a phone in an office that has many floors and many
extensions. Typically, a specific IP address range is configured for each floor of a
building so that all users on that floor use the same CESID for 911 calls.
If a DHCP server is present, an IP phone will automatically receive an IP address within
the specified range when it is connected to the network.
Sending the CESID for a specified IP address range for outbound 911 calls works best
for larger organizations where simply identifying the site’s street address would not
provide enough information for an emergency response team to locate the caller (see ).
Furthermore, this option offers the best flexibility, the highest accuracy, and is the least
likely to become out of date in the PSAP’s 911 database. This option is defined on the IP
Phone Address Map page.
Figure B-3 IP Address Mapping – Best for Larger Offices
CESID of the controlling switch – Similar to the previous option, the Caller’s
Emergency Service Identification ID (CESID) of the controlling switch can also be sent
to the service provider during outbound 911 calls. With this option, a CESID number
is assigned to a phone switch and for any phone plugged into this switch, the switch’s
CESID is sent for outbound 911 calls. This option is best for larger organizations in
which users are calling from analog phones (see ). Using the IP Phone Address Map
method will not work with analog phones. This approach ensures that the emergency
response team is sent to the approximate vicinity of the calling party. This option is
defined on the Switch Edit page.