in accordance
with the existing standard guidelines to one of the following centers:

o Special Services Center (SSC)
o Major Accounts Center (MAC)
o Serving Test Center (STC)
o Toll Control Center (TCC)

The SSC/MAC designation is used in this document interchangeably for
any of these four centers. The Special Services Centers (SSCs) or
Major Account Centers (MACs) have been designated as the trouble
reporting contact for all E911 customer (PSAP) reported troubles.
Subscribers who have trouble on an E911 call will continue to contact
local repair service (CRSAB) who will refer the trouble to the SSC/MAC,
when appropriate.

Due to the critical nature of E911 service, the control and timely
repair of troubles is demanded. As the primary E911 customer contact,
the SSC/MAC is in the unique position to monitor the status of the
trouble and insure its resolution.

System Overview
~~~~~~~~~~~~~~~

The number 911 is intended as a nationwide universal telephone number
which provides the public with direct access to a Public Safety
Answering Point (PSAP). A PSAP is also referred to as an Emergency
Service Bureau (ESB). A PSAP is an agency or facility which is
authorized by a municipality to receive and respond to police, fire
and/or ambulance services. One or more attendants are located at the
PSAP facilities to receive and handle calls of an emergency nature in
accordance with the local municipal requirements.

An important advantage of E911 emergency service is improved (reduced)
response times for emergency services. Also close coordination among
agencies providing various emergency services is a valuable capability
provided by E911 service.

1A ESS is used as the tandem office for the E911 network to route all
911 calls to the correct (primary) PSAP designated to serve the calling
station. The E911 feature was developed primarily to provide routing
to the correct PSAP for all 911 calls. Selective routing allows a 911
call originated from a particular station located in a particular
district, zone, or town, to be routed to the primary PSAP designated to
serve that customer station regardless of wire center boundaries.
Thus, selective routing eliminates the problem of wire center
boundaries not coinciding with district or other political boundaries.

The services available with the E911 feature include:

Forced Disconnect Default Routing
Alternative Routing Night Service
S