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Tech Stuff - 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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