1
Scope
2 References
3 Definitions
4
Abbreviations
5
Introduction
5.1
Overview
of Text over IP
5.2
ToIP
system architecture
5.3
Compliance
requirements
5.4
Relationship
with other V.15x Recommendations
6
Text
telephone-over-IP functions
7
Connection
and network scenarios
7.1
Service
and performance requirements for ToIP
7.2
Audio
and text functionality
8
Transport
methods
8.1 Audio mode
8.2 VBD mode
8.3 Text relay mode
8.4
Switching
between transport modes
9
ToIP
operational modes
10 Text Relay PHY layer operation
11 IP transport for text relay
11.1
Single
and dual port operation of text relay
11.2
Text
relay throughput
12 Support of DTMF in ToIP
13 Transition out of text relay
14 T.140 encoding of text relay
14.1
Character
set support
14.2
TIA-825A and T.50 encoding
requirements
15 Gateway-to-gateway protocol definitions and procedures
15.1
Gateway
capability and call set-up messages
15.2
Gateway
call discrimination messages
16 Start-up mode of operation
16.1
Inter-relationship
with V.150.1
16.2
Inter-relation
with V.152
17 Voiceband data modem interworking requirements
18 Facsimile interworking requirements
19 Call set-up procedures
20 Call discrimination procedures
20.1
V.8 bis
processing
20.2
V.8
CI/XCI processing
20.3
Call
discrimination overview
20.4
Call
discrimination SDL diagrams
20.5
Visual
flow control
Annex A –
Procedures for the optional support of SPRT protocol
A.1
Overview
A.2
SDP
negotiation
A.3
H.245
negotiation
Annex B –
Definition of capabilities for use within H.245-based systems
Annex C –
SDP description of sessions supporting V.151
Annex D –
Interworking IP text devices with V.151 gateways
D.1
Introduction
D.2
Exchanging
capabilities and opening media streams
D.3
State
transition and text handling
Annex E –
Payload format and signaling syntax for real-time text transported within an audio stream
E.1
Overview
E.2
Payload
format
E.3
Use
of redundancy
Appendix I
– Background to PSTN text telephony
Appendix II
– ToIP call discrimination call flows
II.1
Scope
II.2
Scenarios
for call discrimination flows
II.3
Scenarios
with SSE protocol being used
II.4
Scenarios
with payload type switching being used
Appendix
III – The use of [IETF RFC 2198] in [ITU-T V.151]
Appendix IV
– Text buffering and transmission
Appendix V – Probing sequence
Bibliography