1
Scope
1.1 Recommendation version
2
References
3
Definitions and abbreviations
3.1 Definitions
3.2 Abbreviations
4
Conventions
5
Introduction
5.1 Compliance requirements
6
Modem-over-IP gateway functions
7
Audio mode
8
Voiceband data mode
8.1 Selection of VBD voice codecs and
other enhanced functionality
8.2 Minimum requirements for VBD
9 Modem relay mode
9.1 Universal-modem relay gateway type
9.2 V.8-modem relay gateway type
10 Operational modes of MoIP
11 Modem relay PHY layer functions
12 Modem relay error control
functions
12.1 Error control configurations
12.2 Error-controlled PSTN links
12.3 Non-error-controlled PSTN links
12.4 Break handling
13 Modem relay trans-compression functions
13.1 No Trans-Compression (N-TCX)
13.2 Single Trans-Compression (S-TCX)
13.3 Double Trans-Compression (D-TCX)
13.4 Mixed-function operation
13.5 Hierarchy for interoperability
13.6 XID/LR profiles for use in modem
relay connection scenario MR1
14 Modem relay data transfer
14.1 Data type definitions
14.2 Support of DLCI
14.3 General statement on the use of
start-stop characters
14.4 Selection of data types
14.5 Mandatory modem relay data types
14.6 Optional modem relay data types
14.7 Gateway-to-gateway control channel
functionality and interfaces
15 Modem-over-IP functionality and interfaces
15.1 Gateway-to-gateway protocol
definitions and procedures
15.2 Gateway
capability and call set-up messages
15.3 Gateway call discrimination
messages
15.4 Modem relay status messages
16 Start-up mode of operation
17 Facsimile interworking
requirements
18 Text telephony interworking requirements
19 Call set up procedures
20 Call discrimination procedures
20.1 V.25 calling tone, V.8 CI
processing and bell-type modem answer tone
20.2 V.8 bis processing
20.3 Call discrimination procedure/answer
tone treatment selection
20.4 Answer tone processing
20.5 Modem-over-IP mode selection
procedures
20.6 CM-JM procedures for determining
MoIP mode
20.7 JM delay procedure
20.8 Call discrimination SDL diagrams
21 Procedures for audio to MoIP
transport switching
22 Procedures for modem relay
operation
22.1 Procedures used for gateway to DCE error control
22.2 Compression negotiation procedures
22.3 Data transfer phase
23 Modem delay procedures
23.1 Initial start up
23.2 Retrain and rate renegotiations
24 Cleardown procedures
25 IP transport
25.1 SPRT packet structure for MoIP
25.2 MoIP content header
Annex A – ASN.1
notation
Annex B – Simple Packet Relay Transport (SPRT) protocol
B.1 Overview
B.2 SPRT transport protocol
specification
Annex C – State
signalling events protocol
C.1 Introduction
C.2 Definition of media states
C.3 RTP packet format for state
signalling events
C.4 Reliability
C.5 State signalling event definitions
Annex D – Procedures
for voiceband data only mode of operation
Annex E – SDP description of sessions supporting SPRT-based modem relay
E.0 Abbreviations
E.1 Introduction
E.2 Optional information
E.3 Examples of complete SDP
descriptors
Annex F – Definition
of capabilities for use within H.245-based systems
F.1 Scope
F.2 Introduction
F.3 Modem over IP (MoIP) capability
identification and exchange
F.4 MoIP capability definition syntax
F.5 Explanation of V150MoIPCapability
elements
F.6 SSE capability identification and
exchange
Appendix I –
Connection scenarios
I.1 Voice Band data (VBD) mode
I.2 Modem relay connection scenario MR1
I.3 Modem relay connection scenario MR2
I.4 Modem relay connection scenario MR3
I.5 Modem relay connection scenario MR4
Appendix II – Call
discrimination call flows
II.1 Scope
II.2 Answer tone treatment
II.3 Call discrimination
Appendix III – Call
discrimination call flows suitable for use with facsimile-over-IP
Appendix IV – Call discrimination call flows suitable for use for
text-over-IP
Appendix V – Summary of DCE signals used during call discrimination
V.1 Definition of answer DCE generated
signals to be considered for discrimination
V.2 Definition of calling DCE
generated signals to be considered for discrimination
Appendix VI –
Descriptions of non-V-series modes of operation
VI.1 Bell 103 mode of operation
VI.2 Bell 212A mode of operation
VI.3 TIA/EIA-825 mode of operation
VI.4 MNP5 mode of operation
Appendix VII –
Gateway implementation guide
VII.1 Scope
VII.2 VBD
VII.3 Rate control for configurations
using SPRT channel 1
VII.4 XID/LR profiles
Appendix
VIII – Bibliography