User manual

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3 Application notes
3.1 Install hardware
The IPXX series IP PBXs use interchangeable FXO/FXS modules. The FXO and FXS signaling
use different modules. Below are the available modules for the system.
FXO: use to connect to the PSTN line
FXS: use to connect to the analog phone.
Install illustration:
1) IP01 with one FXO
2) IP04 with two fxo two fxs modules.
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