Panasonic KX-TD500 Installation Manual page 191

4.3.1 Trunk Group
Value Range
Parameter
(default)
PBX dial tone 1. Enable
2. Disable
(Disable)
Cyclic Signal 1. No check
Detection [Disable]
2. Check
[Enable]
(Check)
Continuous 1. No check
Signal Detection [Disable]
2. Check
[Enable]
(Check)
Silence 1. No check
Detection [Disable]
2. Check
[Enable]
(Check)
4-52 System Programming
Description/Function
Specifies whether or not the system sends the pseudo
dial tone to the extension user who seizes a CO line.
[Note]
• This assignment is required if the Central Office does
not send a dial tone to the caller.
Used to disconnect the trunk line if the system detects a
cyclic signal during a CO-to-CO line call by DISA.
Used to disconnect the trunk line if the system detects a
continuous signal during a CO-to-CO line call by DISA.
Used to disconnect the trunk line if the system detects
no signal during a CO-to-CO line call by DISA.
Reference