Q.931 Signal Information Element

The Signal Information Element provides indications of the tones that should applied locally at the CPE. More than one Signal IE may be supplied in a message.

Signal Format

The Signal IE is variable length with the following format:

8	7	6	5	4	3	2	1	Octet
0	Signal IE (0x34)							1
length of the Signal Information								2
Signal Value								4

Signal Value

The following table shows the hexadecimal value.

Hex	Meaning
0x00	Dial tone on
0x01	Ringback (audible ring) tone on
0x02	Intercept tone on
0x03	Network congestion (reorder) tone on
0x04	Busy tone on
0x05	Confirm tone on
0x06	Answer tone on
0x07	Call waiting tone on
0x08	Off-hook warning tone on
0x09	Custom tone on
0x11	Recall dial tone on
0x0B	Busy verify tone on
0x0C	Error tone on
0x0D	Stutter dial tone on
0xFD	Expensive routing tone on
0x3F	Tones off
0x40	Alerting on - pattern 0
0x41	Alerting on - pattern 1
0x42	Alerting on - pattern 2
0x43	Alerting on - pattern 3
0x44	Alerting on - pattern 4
0x45	Alerting on - pattern 5
0x46	Alerting on - pattern 6
0x47	Alerting on - pattern 7
0x4F	Alerting off
0x60	Reserved
0x61	Ziptone
0x7F	Unspecified

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Q.931 Signal Information Element

Signal Format

Signal Value

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