GAI-Tronics IPE2500A, IPE2500A-MLS Paging Encoder / Desktop Controller User and Installatoin Manual - Manual (Page 25)

IPE2500A and IPE2500A-MLS Paging Encoder/Desktop Controller Operation
19 03/12
DTMF Decode
The DTMF decoder is primarily used for automatic number identification, or ANI, by the dispatch
operator. ANI is used to communicate to a dispatcher the identity of the transmitting radio. This use of
DTMF is transmitted only in one direction without the receiving unit acknowledging the receipt of
information.
When the field unit presses the PTT button of the radio, the radio generates a preprogrammed sequence
of DTMF digits prior to opening the voice path of the radio. The IPE2500A decodes these digits and
displays the ID either numerically or with a preprogrammed alias. The dispatcher then knows, without
the field radio user having to speak his identity, which radio is being received.
H.E.A.R. System Operation
The H.E.A.R. (Hospital Emergency Administration Radio) system operation is typically used in hospital
emergency rooms. During H.E.A.R. operation, the internal speaker of the IPE2500A would typically be
muted so that normal radio traffic is not heard in the emergency room. A DTMF sequence is transmitted,
prior to voice transmission, by ambulance or public safety personnel to access the emergency room’s
radio system.
To perform H.E.A.R. functions, the desk set contains a base ID used to deactivate the speaker mute.
When the desk set decodes a valid DTMF sequence, it compares the sequence to the H.E.A.R. base ID.
If the ID matches, the desk set unmutes the speaker, allowing received audio to be heard by emergency
room personnel. The unit must be returned to mute mode manually.
The speaker mute is achieved by programming a mute button using the programmable buttons found on
the front panel of the IPE2500A. An optionally installed H.E.A.R. system relay and/or audible 2 kHz
alert tone of programmable duration can also be programmed for activation upon receipt of the proper
base ID. Refer to the CARD Suite Help file for detailed programming instructions.
N OTE : H.E.A.R. System operation or DTMF Decode is not available with the IPE2500A-MLS.