ITU-T ISDN Recommendations
This hypertext page contains a selected combination of the following ITU-T
Recommendations :
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Q.931 (05/98)
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SERIES Q: SWITCHING AND SIGNALLING
Digital subscriber Signalling System No. 1 - Network layer
DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 (DSS 1) - ISDN USER-NETWORK INTERFACE LAYER 3 SPECIFICATION FOR BASIC CALL CONTROL
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Q.932 (03/93)
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DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1
NETWORK LAYER
DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 (DSS 1) – GENERIC PROCEDURES FOR THE CONTROL
OF ISDN SUPPLEMENTARY SERVICES
Circuit switched calls
Message functional definitions and content
General message format and information elements coding
Timers
Protocol control
- Detailed protocol control (user side)
- U0 state
- U1 state
- U2 state
- U3 state
- U4 state
- U6 state
- U7 state
- U8 state
- U9 state
- U10 state
- U11 state
- U12 state
- U15 state
- U17 state
- U19 state
- U25 state
- Any state
- Any state except U0, U19
- Any state except U0, U1, U6, U17, U19
- Any state except U0, U1, U6, U17, U19, U25
- Any state except U0, U1, U19
- Any state except U0, U1, U6, U11, U12, U15, U17, U19
- Any state except U0
- Any states U0, U2, U25
- Specific state
- Relevant states
- Restart 0
- Restart 1
- Restart 2
- Detailed protocol control (network side)
- N0 state
- N1 state
- N2 state
- N3 state
- N4 state
- N6 state
- N7 state
- N8 state
- N9 state
- N10 state
- N11 state
- N12 state
- N15 state
- N17 state
- N19 state
- N25 state
- Any state
- Any state except N0, N19
- Any state except N0, N1, N6, N17, N19
- Any state except N0, N1, N6, N17, N19, N25
- Any state except N0, N11, N12, N19, N22
- Any state except N0, N6, N9, N11, N12, N19, N22
- Any state except N0
- Any state sxcept N0, N2, N25
- Specific state
- Relevant states