11
GSM transmission:
PBX:
If the first digit of a dialling code is the digit entered here (usually
“0”), this is deleted.
CONSTANT:
If the dialling code entered remains after the first digit is deleted
(see PBX), it remains when switching from PSTN to GSM.
REMOVE:
If the dialling code entered remains after the first digit is deleted
(see PBX), it is deleted when switching from PSTN to GSM.
ADD:
If an additional dialling code has to be added, it is defined under
ADD. If the CONSTANT code is effective, this additional dialling
code is not added.
Example:
The telephone number of the emergency service to which protocols are transmitted
is 021/123456. A voice message is also sent to the mobile phone number
0160/654321.
The telephone line of the alarm centre is linked to the telephone line of the GSM-
Interface that is connected to a PBX (extension line). To get an outside line, a “0”
has to be dialled. Since the GSM-Interface is also in Birmingham, no local area
code has to be dialled for the PSTN.
PSTN standard transmission:
If the GSM-Interface recognises an existing PSTN telephone line, the dialler
forwards incoming calls of connected equipment (e.g. an alarm system).
>>>The telephone number in the alarm centre is specified as 0123456, since a 0 is
needed to get an outside line and no local area code is needed. The mobile phone
number is entered as 00160654321.
GSM transmission (PSTN failure):
>>> Under NS, a 0 must be programmed since it is no longer necessary to get an
outside line as with PSTN.
>>> The digit 01 is defined under CONSTANT.
>>> The local area code 021 must be defined under ADD.
>>> Due to the settings for ADD and CONSTANT, the device no longer sends
0123456 over GSM to the emergency centre, but the following number instead:
021/123456. The voice message is sent to the mobile phone number 0160/654321.
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