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Section 6 Interface to Application
68
6.6.19 Overload Indication
Note: This message is only applicable to ITU-T operation.
This primitive is used by the ISUP module to indicate that the remote switch
is in overload. It is sent when an Overload message is received from the
remote switch during outgoing call set-up. On receipt of this indication, the
application should re-route the call (if possible).
The Overload indication will be followed by a Release indication (cause value
= 42). Release of the original outgoing circuit does not complete until timer
T3 expires, so preventing the circuit being reused while the remote switch is
in overload.
Message type
OLM (Overload Message)
Mandatory parameters
None
Optional parameters
None
6.6.20 Pre-Release Information Indication
Note: This message is only applicable to ITU-T operation.
This primitive can be issued in all call states up until release. It is used by
the ISUP module to convey end-to-end information.
Message type
PRI (Pre-Release Information)
Mandatory parameters
None
Optional parameters
• Optional forward call indicators
• Optional backward call indicators
• Message compatibility information
• Parameter compatibility information
• Application transport parameter
This parameter may be repeated (see
Appendix E: ISUP Repeat
Parameters
on page 197).
• End of optional parameter
- Dialogic 1
- SS7 Protocols 1
- Contents 3
- Figures 6
- Revision History 7
- About this Publication 9
- 1.3 Related Documentation 10
- 1.4 Feature Overview 11
- 2 General Description 13
- Value Mnemonic Meaning 14
- 3 Internal Data Structures 17
- 4.1 System Functions 19
- 4.2 Timer Operation 19
- 5 Interface to MTP 21
- Section 5 Interface to MTP 22
- 6 Interface to Application 23
- 6.2.2 Receive Indication 24
- 6.5.1 Alerting Request 28
- 6.5.6 Confusion Request 32
- 6.5.7 Continuity Request 32
- 6.5.9 Exit Request 33
- 6.5.10 Facility Request 33
- 6.5.11 Facility Response 35
- 6.5.15 Information Request 37
- 6.5.19 Overload Request 40
- 6.5.21 Proceeding request 41
- 6.5.22 Progress Request 42
- 6.5.23 Release Response 43
- 6.5.24 Release Request 44
- 6.5.26 Resume Request 45
- 6.5.27 Segmentation Request 46
- 6.5.28 Setup Request 46
- 6.5.29 Setup Response 49
- 6.5.31 Suspend Request 52
- 6.6.1 Alerting Indication 56
- 6.6.6 Confusion Indication 60
- 6.6.7 Continuity Indication 61
- 6.6.9 Exit Indication 61
- 6.6.10 Facility Indication 62
- 6.6.11 Facility Confirmation 63
- 6.6.19 Overload Indication 68
- 6.6.21 Proceeding Indication 69
- 6.6.22 Progress Indication 70
- 6.6.23 Release Confirmation 71
- 6.6.24 Release Indication 71
- 6.6.26 Resume Indication 73
- 6.6.28 Setup Confirmation 74
- 6.6.29 Setup Indication 76
- 6.6.31 Suspend Indication 79
- 6.7 Parameter Definitions 80
- 6.7.1 Called Party Number 86
- 6.7.2 Calling Party Number 86
- 6.7.3 Cause Indicators 87
- 6.7.4 Custom Parameter 88
- 6.7.5 Message Data 88
- 6.7.7 Tariff Type 89
- 6.7.8 Unrecognised Parameter 90
- 6.8.3 Hop Counter Procedure 94
- 6.8.4 Continuity Testing 95
- Call Set Up 99
- Service 108
- 6.8.6 Message Segmentation 109
- 7 Management Interface 113
- reserved Set to zero 116
- 7.6 Local Overload Request 118
- Parameters 120
- 8 Non-Primitive Interface 121
- 8.3.1 Timer default values 138
- 8.5 Variant Initialisation 141
- operation 142
- message type 142
- 8.8 Read RAM Request 145
- 8.10 Read Circuit Request 146
- 8.11 Read Revision Request 146
- Section 150
- Event specific data 158
- Call states 164
- 8.22 Trace Event Indication 166
- A.1 German ISUP 171
- A.2 UK ISUP 172
- A.3 Japan (TTC) ISUP 173
- A.4 Nortel RLT 174
- A.4.2 Nortel RLT (ITU) 175
- A.5 Italian ISUP 176
- A.6 French ISUP 177
- A.7 China ISUP 178
- A.8 Finnish ISUP 180
- A.9 BICC 180
- Hex Dec Min Max 181
- Reference 181
- ISUP Module 183
- B.2 ITU-T Parameters 184
- B.3 ANSI T1.113 Messages 188
- B.4 ANSI T1.113 Parameters 189
- More Extended Options 195
- Appendix F: Timer Services 199
- F.1 Timer Expiry 200
- Variant Initialisation, 141 203
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