Alphatech Fermax PBX EXP Installation Guide download pdf (Page 9)

Please do not use systems which do not support DTMF transmission during the

call from the wireless DECT phone to the other wireless DECT phone (e.g.

DTMF transmission is required when you need to use the DTMF command for

opening the door). DistyBox has got its own power supply. it works as a DECT

to analog line convertor. The door phone panel is connected to this analogue

line.

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Alphatech Fermax PBX EXP Installation Guide Page 9