call progress tones: United Kingdom

Table 1. Tone parameter values (United Kingdom) .
This table describes the characteristics of United Kingdom call progress tones. For each different tone name (Dial Tone, Ring Tone, and Busy Tone) the minimum, nominal, and maximum frequency in Hertz is listed, followed by the minimum and maximum power ratios in decibels. Continuous tones are identified, and for discontinuous tones, details of the minimum, nominal, and maximum durations in milliseconds that the tone is on and off are listed.
Tone Name	Tone Label	Tone Type	Frequency n (Hz)				Level (dBm)		Time On (ms)			Time Off (ms)
Tone Name	Tone Label	Tone Type	n	Min	Nom	Max	Min	Max	Min	Nom	Max	Min	Nom	Max
Dial Tone	Dial	Dial	1	319	350	382	-30	-9	Continuous tone
Dial Tone	Dial	Dial	2	400	440	480	-30	-9	Continuous tone
Ring Part 1 Tone	Ring, Part 1	Ring	1	364	400	436	-40	-9	320	400	480	140	200	240
Ring Part 1 Tone	Ring, Part 1	Ring	2	410	450	491	-40	-9	320	400	480	140	200	240
Ring Part 2 Tone	Ring, Part 2	Ring	1	364	400	436	-40	-9	320	400	480	1680	2000	2320
Ring Part 2 Tone	Ring, Part 2	Ring	2	410	450	491	-40	-9	320	400	480	1680	2000	2320
Busy Tone	Busy	Busy	1	364	400	436	-40	-9	300	375	440	300	375	440
Busy Network Tone	Busy, Network	Network Busy	1	364	400	436	-40	-9	160	225	280	420	525	620

Call progress tones: United Kingdom