2N Lift emergency phone 2N SingleTalk - Manual, 1514 v6.3.0 - Manual (Page 44)

ST Connecting Options 2.7
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 Choose the optimum location for your antenna.
 Use an external directional antenna for places with a bad signal quality.
 Ensure that your GSM gateway function will go on working upon power
failure without the need to enter the PIN.
 Safeguard the GSM gateway SIM card against misappropriation.
PBX Connection
Advantages and disadvantages
This is the cheapest connecting option wherever a PBX and an unoccupied PBX line are
available. Where the ST is connected to a non-stop well-trained service personnel
only, its operation costs are zero.
Caution
 Make sure that your PBX is protected against power outage. In the event
of power outage, non-backed-up PBXs switch over some of their lines
directly to CO lines and, in that case, the ST may call another subscriber if
a prefix is used! For a smart solution see the Tips below.
For the ST to call outside the building (i.e. via PSTN):
 The line to be used must have the relevant call barring status (use a common
telephone and try to call “outside” for check)
 While programming, add prefixes for PSTN seizure (typically a zero), or select
a direct PSTN line seizure.
 To enable dispatcher center – ST calling, identify the line (extension) to be
used and how to reach it from the outside (dial-in, DISA, operator), and select
the appropriate PBX configuration (allowing to call the ST even in the night
without an operator).
 Select the appropriate call barring status for the extension to be used if any of
the pre-programmed numbers is a mobile (GSM) one.
 Agree with the PBX owner on operation costs (ST outgoing calls are at the
owner’s account).
Tips
 The operational costs can be solved by the “green line” (prefix 0800) calls.
 The so-called automatic CO line seizure (without dial-in) is a practical
solution, which, in the case of ST switchover to a PSTN line due to power
outage, makes the ST always call the right number.