Operational overview – Teo E911 Response System Installation User Manual
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Teo E911 Response Server 9145 Installation Instructions
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13-280133 Rev. C
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The 9145 monitors calls that originate from the PBX towards the Telco network. When a
911 call is detected, the 9145 changes or passes through the 911 network-bound callers
telephone number (ANI) according to a user programmed database (station table).
The PBX must be programmed to route 911 calls to the ISDN-PRI port that is connected to
the 9145. Once a caller using the PBX goes off hook and dials 911, the calling party's 3- to
10-digit station number is sent to the 9145 via the ISDN-PRI Data Channel (D Channel). This
number is then used as the input to the internal station table database to retrieve the
translated 10-digit ANI for the caller's station.
The 10-digit translated ANI is forwarded via the Telco ISDN-PRI D channel toward the 911
network. The ANI is sent to the 911 Call Taker and the Automatic Location Information (ALI)
is retrieved from the Telco ALI database using the received ANI. Upon answer of the 911
call, the voice connection is then completed between the PBX caller and the 911 Call Taker.
The 9145 generates a call start record at the time it receives the 911 call from the ISDN-PRI
connection. The call start record is recorded in the system's Log file and, if programmed to
do so, the system will report the event to PC Popup Displays and other reporting devices.
When the 911 call ends, the 9145 will generate a call disconnect record that is also logged
and reported. The call disconnect record is sent to the reporting devices.
The 9145 also has the ability to “mask” the outgoing caller ID on non-911 calls. If call
masking is enabled, the caller ID sent for non-911 calls may be replaced with another local
or pilot number. Sensitive areas such as school classrooms may want a pilot number or
administration number presented as the caller ID for non-911 calls.