Panasonic DBS 824 Manual page 281

Software Version CPC-S and CPC-M, Version 1 0 and higher
Address FF2 (Trunk)# 2# (0 or l)#
Description
Use this feature to set a trunk for D'T'MF or pulse dialing (10 pulses per
second)
Programming
2-4
FF2 (l-6 or I-8)# 2# (0 or l)#
Trunk Number
CPC-S l-6
CPC-M l-8
l=Pulse dialing (10 pps)
Issued 3/l /95
FF2