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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