Administrator's Guide

Features and technical reference
555-233-5061904 Issue 5 October 2002
CAMA — Centralized Automatic Message
Accounting (E911)
CAMA trunks route emergency calls to the local community’s Enhanced 911
systems and provide CESID information to the system. Public Service Answering
Points (PSAP) use CAMA trunks to determine the caller’s physical address.
NOTE:
Avaya does not recommend tandeming 911 calls.
When the CAMA feature is administered and a 911 call is placed from an Avaya
MultiVantage station, MultiVantage software searches for the proper CAMA
Touch-Tone Receiver (TTR) resource in the port network (PN) where the CAMA
trunk group is located. If the proper CAMA TTR resource is not available in that
port network, the software checks any other available port networks for the
CAMA TTR. If none is found in the entire system, a busy tone is returned to the
calling party. However, if another trunk group is in the same routing pattern as the
CAMA trunk group, the call routes to the next available trunk group in the pattern.
For example, if a CO trunk group is used, then any available TTR resource can be
used and the call routes as a normal call over the CO trunk and the public switched
telephone network.
E911 systems use CESID information to identify the location of the calling phone.
The following features can cause incorrect CESID information to be sent with a
911 call.
Bridged stations
911 calls from a bridged extension will report the CESID of the principle station.
EAS agents
911 calls from an agent in an EAS skill will report the CESID of the physical
station, not the logical agent.
Personal Station Access/Terminal Translation Initialization
When you use PSA or TTI to associate a phone with another extension, the switch
will report the CESID of the extension — not the physical phone associated with
it.