What do you use an FXS for?
A.
an analog telephone
B.
a PBX
C.
an IP phone
D.
an E1
What do you use an FXS for?
What do you use an FXS for?
What do you use an FXS for?
What do you use an FXS for?
A.
an analog telephone
B.
a PBX
C.
an IP phone
D.
an E1