ABUS FU8006 Secvest 2WAY Wireless Alarm Control Panel (UK, DK, IT) Operating instructions - Manual (Page 43)

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18.12. Telephone Call
This menu is used to start a telephone call manually and test the telephone
line or GSM connection. The system uses the integrated loudspeaker and
microphone to establish a voice connection.
Select the “Telephone Call” menu item.
Enter the new number using the keypad. The number is dialled by pressing
“OK”. The number is removed by pressing “Delete”.
The system starts to dial the entered number and establishes a voice
connection.
However, it may not be possible to hold a proper two-way conversation,
depending on the type of line to which the system
is connected. The following applies to the connections:
PSTN
One can make a call and listen to the other end, and one can send DTMF
tones from the control panel. This service can be used
to select options from an automatic answering service or to control devices at
the other end of the line
ISDN
One can make call and hold a proper two-way conversation with a person at
the other end of the line. One can also send DTMF tones from
the control panel.
GSM
One can make a call and listen to the other end, and one can send DTMF
tones from the control panel.
This type of connection works with an automated answering service such as
those used, for example, by many mobile telephone service providers
for the registration of SIM cards and the recharging of prepaid cards. If one
tries to hold a 2-way conversation,
the person at the other end of the line may have difficulty understanding you.