TECHNICAL REFERENCE AND USER’S GUIDE
REV A
GSM GATEWAY
UTILIZATION
GT20/GT10 will be ready for utilization after the entire connections are completed and
programming is done.
GSM calls can easily be made by accessing the line which is connected to GT20/GT10 or
through the phone that is directly connected to the GT20/GT10.
In case GT20/GT10 used with a KAREL exchange, the LCR feature of the exchange would
make the utilization of GT20/GT10 very effective and easy. Thanks to that feature, the
extension would make calls as if they are making a normal call (without the necessity
for dialing a special line access code) and that call will be automatically forwarded to
GT20/GT10 by the exchange.
For example: Suppose that there is a GSM operator line serving both modules on GT20
with the prefix 0562 and GT20 has been connected to the lines 01 and 02 on MS48
exchange. In that case, by entering the LCR program to the exchange extensions are
automatically forwarded to the lines 01 or 02 as soon as they dial “90562” in order to
make an external line call. By this way, since the calls are made over the GSM modules
on GT20, call tolls will be much less than the calls made over normal lines. On the other
hand, when the LCR feature is not used, first of all the extension is supposed to access
the lines 01 and 02 and then dial the number. GSM calls will be made over normal lines
and effectiveness of GT20 will decrease.
Moreover, a GT20/GT10 that has been connected to Karel exchange will be able to
transmit the CLIP information to the extensions, thanks to the ID12 Caller ID unit that
will be connected to the exchange and the feature telephones that the extensions will
use. Therefore, owners of the telephone sets with displays or the Karel pager owners
will be able to see the phone number of the caller.
Please contact your authorized reseller to get detailed information about those
services.
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TROUBLESHOOTING
The GT20/GT10 GSM Gateway does not contain units that the user can directly intervene.
Yet it would be useful for the user to check for the items below in case of certain
problems and detect the source of the problem in order to increase the speed of the
technical service to be presented or solve some simple problems immediately.
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