9-27C5 B
 What is the configuration Thrane & Thrane F500 for standard voice telephone operation?
A. RJ11 Port 1 and 2 set to 3.1 kHz.
B. RJ11 Port 1 and 2 set to standard voice.
C. ISDN Port set to 3.1 kHz.
D. ISDN Port 1 and 2 set to standard voice.
