Byte

Description

0, 1

Tag 0x275C

2, 3

Length Variable

4, 5

Value[1] Signal Value

0x0000 Dial tone on

0x0001 Ring back tone on

0x0002 Intercept tone on

0x0003 Network congestion tone on

0x0004 Busy tone on

0x0005 Confirm tone on

0x0006 Answer tone on

0x0007 Call waiting tone on

0x0008 Off hook warning tone

0x0009 Preemption tone on

0x000A Tone off

0x0010 to 0x010F Alerting on pattern 0x00 to 0xFF
(Cadence ringing type)

All other values are reserved.