1 Scope
1.1 Block diagram and functional elements
1.2 System elements outside the scope of this Recommendation
1.3 Functional elements covered by this Recommendation
2
References
3
Definitions
4 Abbreviations
5
Conventions
6
Functional requirements
6.1 Required elements
6.2 Information streams
6.3 Modem
6.4 Multiplex
6.4.1 Logical channel numbers
6.4.2 Multiplex table entries
6.4.3 Flow control
6.4.4 Error control
6.4.5 Adaptation layers
6.5 Control channel
6.5.1 Capabilities exchange
6.5.2 Logical
channel signalling
6.5.3 Mode preferences
6.5.4 Interface to multiplex
6.5.5 Timer and counter values and protocol
errors
6.6 Video channels
6.6.1 Interface to
multiplex
6.7 Audio channels
6.7.1 Delay compensation
6.7.2 Maximum delay jitter
6.7.3 Interface to multiplex
6.8 Data channels
6.8.1 Data
protocols
6.8.2 Data applications
7
Terminal procedures
7.1 Phase A Call set-up of voiceband channel
7.2 Phase B Initial analogue telephony communication
7.2.1 V.8 procedure
7.2.2 V.8 bis
procedure
7.3 Phase C Establishment of digital communication,
modem training
7.3.1 V.8 procedure
7.3.2 V.8 bis
procedure
7.4 Phase D Initialization
7.4.1 Exchange of video by mutual agreement
7.5 Phase E Communication
7.5.1 Rate changes and retrains
7.5.2 Involuntary disconnection
7.6 Phase F End of session
7.7 Phase G Supplementary services and call clearing
8
Interoperation with other terminals
8.1 Speech only terminals
8.2 H.320 multimedia telephone terminals over the ISDN
8.3 Multimedia telephone terminals over mobile radio
9
Optional enhancements
9.1 Data facilities
9.2 Encryption
9.2.1 EncryptionSE messages
9.2.2 Encryption initialization vector (EIV)
channel
9.2.3
Encryption procedure
9.2.4 Encryption initialization vectors
9.2.5 Error recovery
9.3 Multilink
10 Multipoint considerations
10.1 Establishment of common mode
10.2 Multipoint rate matching
10.3 Multipoint lip synchronization
10.4 Multipoint encryption
10.5 Cascaded MCU operation
11 Maintenance
11.1 Loopbacks for maintenance purposes
11.1.1 Normal mode
11.1.2 System loopback
11.1.3 Media loopback
11.1.4 Logical channel loopback
Annex A Protocol stack for control channel
A.1 General
A.2 SRP mode
A.2.1
SRP command frames
A.2.2 SRP response frames
A.2.3 SRP procedure at transmitter
A.2.4 SRP procedure at receiver
A.2.5 Numbered SRP Response Frames (NSRP)
A.3 LAPM/V.42 mode
Annex B HDLC frame structure transparency for asynchronous transmission
Annex C Multimedia telephone terminals over error prone channels
C.1 Abstract
C.2 General
C.3 Changes to procedures
C.4 Interworking
C.5 Terminal procedures
C.6 Initialization of multiplex level at the start of a session
C.6.1 Definition of stuffing sequences
C.6.2 Definition of level set-up procedure
C.6.3 Definition of the parameters for the
control channel
C.6.4 Definition of other parameters
C.7 Dynamic change of level or option during session
C.8 Control channel definition for mobile terminals
C.8.1 Control Channel Segmentation and
Reassembly Layer (CCSRL)
C.8.2 NSRP mode
C.8.3 LAPM/V.42 mode
Annex D Operation on ISDN circuits (H.324/I)
D.1 Scope
D.2 References
D.3 Definitions
D.4 Functional requirements
D.4.1 Modem interface
D.4.2 H.320 ISDN interoperation
D.4.3 H.324 GSTN interoperation
D.4.4 Voice telephone interoperation
D.4.5 NSRP support for H.245 control channel
D.4.6 V.140 support
D.4.7 terminalOnHold
D.5 Terminal procedures
D.5.1 Phase A Call set-up of
digital channel
D.5.2 Phase B Initial telephony
communication
D.5.3 Phase C Establishment of
digital communication
D.5.4 Phases D through G
Annex E Timer T401 initialization for operation over geostationary satellite
channels
E.1 Introduction
E.2 Determination of timer value
E.3 Timer tuning procedure
Appendix I Bit and octet order
Appendix II V.8 bis codepoints