Panasonic KX-T336 System Reference Manual page 387

Condftlons
(External First Digit Time-Out timer assignment)
When CO Access Instantly is utilized, we recommend to set System-System
Iimer 'External First Digit lime-Out" timer longer than length of CO dial tone
delay.
This setting can be ranged from 5 to 120 seconds.
Refer to Section 9-D-3.00 "System Timer" or
Section 1 O-C-6.00 "System Timer (TIM)."
'b
1 O-C-96
(21292)