NEC SL2100 Features And Specifications Manual page 564

SL2100
Program
No.
20-09-09 Class of Service Options (Incoming Call Service)
- Deny Collect Call Receiving
I
1-550
Program Name Input Data
0 = Off
1 = On
ISDN Compatibility - Collect Call Blocking
ISSUE 1.0
Default
COS 01 ~ 15 = 0