Phoenix Quattro User Manual page 16

telephone is disconnected. As such the telephone is currently not functional and
you cannot utilize its dial-pad, unless you switch the call back to your telephone
(see C below).
b. Accepting a call: when your telephone rings you can push L1 (or L2 if the call is
coming from line 2) to accept the call on the Quattro. No need to pickup the
handset.
c. Switching back to your telephone: Pickup the telephone's handset and push L1 (or
L2 if the call is on line 2). The Quattro will be disconnected form the line and you
can use your telephone ordinarily.
PSTN Functional Diagram
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L1
Phoenix Audio Technologies
Telephone
Line
www.phnxaudio.com