Signaling, Tones, and Transmission
United Kingdom
Tone Plans
Tone plans permit the station user to distinguish different stages of call progress and different
types of calls. Each tone is assigned a level which ensures an acceptable quality.
Port iONS ONS OPS DGS WAN DCO iACO iACOs ACO ACOs ATT abONS abACO abACOs abACOhl
Loss
iONS
151512555 4 5 45315 4 5 4
ONS
151512555 4 5 45315 4 5 4
OPS
12109222 1 2 12012 1 2 1
DGS
10 8 7 0 0 0 -1 0 -1 0 -2 10 -1 0 -1
WAN
10 8 7 0 0 0 -1 0 -1 0 -2 10 -1 0 -1
DCO
10 8 7 0 0 0 -1 0 -1 0 -2 10 -1 0 -1
iACO
4 41-5-5-6-5 -4 -5-5-7 4 -5 -4 -5
iACOs
5 52-5-5-5-6 -5 -5-5-7 5 -6 -5 -6
ACO
4 41-6-3-3-5 -5 -5-5-6 4 -5 -5 -5
ACOs
5 52-5-3-3-5 -5 -5-5-6 5 -5 -5 -5
ATT
8 85-2-2-2-3 -2 -3-2-4 8 -3 -2 -3
abONS
151512555 4 5 45315 4 5 4
abACO
4 41-6-5-6-5 -4 -5-5-7 4 -5 -6 -5
abACOs
5 52-5-5-5-6 -5 -5-5-7 5 -4 -5 -4
abACOhl
1 1 -2 -9 -9 -9 -5 -4 -5 -5 -7 1 -5 -6 -5
Notes:
• DTMF tones are supported.
• Digital (DGS) and IP (WAN) tones are conveyed as Real-Time Transfer Protocol (RTP) packets.
• " " indicates that this interface is not supported in this country.