ARA-1 Operations Manual
INTEROPERABILITY NOW
3-15
3.4.1
Configuring Outgoing Call Initiation via DTMF
Enter a valid DTMF sequence that will be transmitted by the radio (such as *100, 999, or other
valid DTMF, up to 10 characters) into one of the
DTMF Sequence
fields. Then enter the
corresponding
Number To Dial.
This must be a valid SIP address, so what is entered here will
depend on your system. It could be a SIP PBX extension number, a SIP PBX phone number, or
an IP address (perhaps of another ARA-1). A full SIP URI may also be entered. When the radio
cabled to the ARA-1 receives any of these preset DTMF sequences, the ARA-1 will attempt to
initiate a connection to the end-user device associated with this
Number To Dial
setting.
NOTE:
Make sure you also program an entry into the
Disconnect
field so you
can terminate the call when you are finished. Something like
***
,
###
, or another
unique sequence is appropriate and will not be confused with a number to dial.
3.4.1.1
Pound Terminated Dialing
The
Pound Terminated Dialing
function allows radio users with DTMF keypads to dial a number
or extension as if they were using a telephone simply by pressing the pound (
#
) key after the
dialing sequence. Whenever this is done, the ARA-1 simply initiates a call to the end user
identified by the DTMF sequence entered (minus the pound). If there is no pound digit appended
to the DTMF detected, the ARA-1 will instead follow the operation outlined in Section 0,
comparing the detected DTMF to the pre-configured
DTMF Sequences
and then calling the
associated
Number to Dial
.
3.4.1.2
Call Progress Prompts
The ARA-1 provides voice prompts (automated voice messages) that allow the radio user to keep
track of the progress of the call (
connecting, disconnecting,
etc.). The factory default setting is
Enable
. If you do not want these prompts transmitted over the radio, set to
Disable
. This function
operates with both the DTMF and the COR Cadence call initiation modes.
3.4.1.3
DTMF Digit Timeout
The
DTMF Digit Timeout
function specifies the maximum time allowed between DTMF digits
during a call initiation sequence. As soon as a pause is measured longer than this setting, the
ARA-1 will consider the DTMF sequence finished. The factory default setting of one second
(1000 ms) should work for most systems.
3.4.2
Configuring Outgoing Call Initiation Via COR Cadence
Many radios do not have DTMF keypads, so the ARA-1 offers an alternative method to initiate
a SIP call.
COR Cadence
is a feature of the ARA-1 whereby radio users can press the PTT button
on their radios a specified number of times at a specified rate to initiate a pre-programmed
connection.
COR (Carrier Operated Relay) is an indication that a receiver is detecting a carrier signal that is
strong enough to open its squelch. Some radios may call this signal the
Squelch Output
(or
similar) rather than the
COR Output
.
When a radio user in the field gives the radio’s PTT switch five quick presses, it will transmit
five quick carrier pulses. These will be picked up by the receiver cabled to the ARA-1, and it will
activate its COR output with five corresponding pulses; this
COR Cadence
will be detected by