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The FXS module provides four ports for connection of up to four analogue phones.
The FXO module provides four inputs for analogue (POTS) lines. This allows integration of your existing phone lines into the Vigor IPPBX 3510.
This module has four ISDN interfaces which can be connected to standard ISDN2e (BRI) lines providing up to 8 voice channels per module.
This module provides two switchable TE/S0 ports and two fixed S0 ports.
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