User's Manual

OSMAC Base User Manual
Page 10
Manu.01_0405
3.2 Placing Telephone Calls from the Two-Way Radio
Two-way radios can place "autopatch" telephone calls through the OSMAC Base to a telephone line
connected to the rear of the OSMAC Base.
The OSMAC Base operates in a simplex mode. In other words, it can only receive or transmit at any
given time, and not both simultaneously. If it is transmitting, it cannot receive, and when it is receiving, it
cannot transmit. Because of this, there are a number of things to keep in mind when making or receiving
a telephone call through the OSMAC Base. One is that the two-way radio user will hear an occasional
ticking sound. This is the OSMAC Base periodically checking for transmissions from the two-way radio.
The other is that users must learn to wait about a second before talking whenever the OSMAC Base
switches between transmit and receive modes.
The OSMAC Base uses a Voice Operated Switch (VOX) circuit on the telephone line. VOX circuit
switches the OSMAC Base from transmit mode to receive mode when it detects that the audio coming in
from the telephone line has stopped.
To place a telephone call:
1. Press the
*7keys on the two-way radio's DTMF keypad. This tells the OSMAC Base that you wish
to place a telephone call.
2. Optionally listen for the confirmation beeps to come back from the OSMAC Base. If autopatch
operation has been disabled from the Configuration Menu, then alternating high and low beeps will
signal an error. If voice prompts have been enabled, then a dial tone will be heard instead of the
beeps.
3. Begin dialing the telephone number you wish to call after the dial tone ends. At the end of the
telephone number, you may enter a
*to dial the phone number. Alternatively, the phone number will
be dialed if no keys are pressed after a few seconds. The DTMF tones being sent to the phone line
will be heard to confirm dialing.
4. Once the called party answers, the phone VOX circuit takes over. When the called party speaks, the
OSMAC Base transmits his or her voice.
5. The mobile user will hear a periodic ticking sound as the OSMAC Base briefly switches to receive
mode to determine whether the mobile user wishes to interrupt the conversation and has begun
transmitting.
6. If neither party is talking, a single beep will be heard periodically to remind the mobile user that the
phone patch is still in operation.
7. A timeout timer exists in order to shut down the phone patch automatically in the event that the
mobile user goes out of range or has a battery outage. Warning beeps or a voice message will be
sent 30 seconds before the timeout timer expires and the phone call is terminated. The mobile or
phone user may press
* in order to reset the timeout timer and continue the phone call.
8. End the conversation from the two-way radio or the phone by pressing the
# key. A high, then low
beep sequence or a voice message should be heard to confirm the disconnection.
3.3 Autodial Calls
The OSMAC Base has 10 "auto-dial" memories containing telephone numbers that can be automatically
dialed. See the Programming section for information on how to program these numbers.
In order to make an Autodial call from a two-way radio:
1. Press the
*6 keys on the two-way radio's DTMF keypad, followed by the number of Autodial
memory you wish to place the call to. Memory number 0 will be used if no number is sent after the *6
command.
2. Operation continues from step 4 as described above.