Panasonic DBS 824 Installation Manual page 259

CO Busy Tone Detection
FF2
Limitation cm Monitoring of Trunks For Busy Tone. The
DBS 824 can
monitor up to 2 trunks at the same time for busy tone, If a third trunk recefves
a busy tone on an outgoing call while 2 other trunks are in Auto-Repeat
Dialing, the system will not perform Auto-Repeat Dialing on the third trunk.
2-20 DBS824-10-400
Issued 3/l/95