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APPENDIX E: Administration Codes and Data
Table E-O.
Trunk Class-of-Service (for all trunks except DID)
TRUNK CLASS-OF-SERVICE
(FOR ALL TRUNKS EXCEPT DID)
COS
NIGHT
OUTWARD
IN
SHORT
CODE SERVICE
SIGNALING
ONLY
DISCONNECT
0
TT
1
TT
●
2
TT
●
3
TT
●
●
4
DP
5
DP
●
6
DP
●
7
DP
●
●
8
●
TT
9
●
TT
●
10
●
TT
●
11
●
TT
●
●
12
●
DP
13
●
DP
●
14
●
DP
●
15
●
DP
●
●
TT=Touch-Tone
DP=Dial-Pulse
E-29