IP Phone User Manual
2.2 System Configuration—Software
Feature Guide 283
2.2 System Configuration—Software
2.2.1 Class of Service (COS)
Description
Each extension is assigned a COS number (  Class of Service [602]). The following features 
are controlled on a COS basis:
a) Internal Call Block (  1.1.2.2 Internal Call Block)
b) FWD (  1.3.1.2 Call Forwarding (FWD))
c) DND Override (  1.3.1.3 Do Not Disturb (DND))
d) Call Pickup (  1.4.1.3 Call Pickup)
e) Account Code Entry (  1.5.4.3 Account Code Entry)
f) External Call Block (  1.5.5.3 Trunk Access)
g) Executive Busy Override (  1.7.2 Executive Busy Override)
h) Call Monitor (  1.7.3 Call Monitor)
i) OHCA (  1.7.4.3 Off-hook Call Announcement (OHCA))
j) Whisper OHCA (  1.7.4.4 Whisper OHCA)
k) TRS/Call Barring (  1.8.1 Toll Restriction (TRS)/Call Barring (Barring))
l) Extension Lock (  1.8.3 Extension Lock)
m) Walking COS (  1.8.5 Walking COS)
n) Trunk Call Limitation (  1.10.8 Trunk Call Limitation)
o) Call Transfer (  1.11.1 Call Transfer)
p) Door Open (  1.16.2 Door Open)
q) DISA (  1.16.6 Direct Inward System Access (DISA))
r) Call Forwarding (CF)—by ISDN (P-MP) (  1.20.1.4 Call Forwarding (CF)—by ISDN 
(P-MP))
s) Wireless XDP Parallel Mode (  1.24.5 Wireless XDP Parallel Mode)
t) SMDR for Outgoing Trunk Call (  1.25.1 Station Message Detail Recording (SMDR))
u) Time Service Switching (  2.2.4 Time Service)
v) Manager Features (  2.2.6 Manager Features)
w) PT Programming (  2.3.2 PT Programming)
Conditions
• Walking COS
Extension users can make a call from other extensions of the lower level COS by using 
their own higher level COS temporarily.
User Manual References
User Manual
1.2.7 Calling without Restrictions










