Specifications for the Network Voice Protocol (NVP)
RFC 741
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(November 1977; No errata)
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NWG/RFC 741 DC 22 Nov 77 42444
SPECIFICATIONS FOR THE
NETWORK VOICE PROTOCOL (NVP)
and
Appendix 1: The Definition of Tables-Set-#1 (for LPC)
Appendix 2: Implementation Recommendations
NSC NOTE 68
(Revision of NSC Notes 26, 40, and 43)
Danny Cohen, ISI
January 29, 1976
NWG/RFC 741 DC 22 Nov 77 42444
Specifications for the Network Voice Protocol (NVP)
CONTENTS
PREFACE iii
ACKNOWLEDGMENTS iv
INTRODUCTION 2
THE CONTROL PROTOCOL 2
Summary of the CONTROL Messages 3
Definition of the CONTROL Messages 4
Definition of the <WHAT> and <HOW>
Negotiation Tables 8
On RENEGOTIATION 10
The Header of Data Messages 10
THE LPC DATA PROTOCOL 13
EXAMPLES FOR THE CONTROL PROTOCOL 15
APPENDIX 1: THE DEFINITION OF TABLES-SET-#1 18
General Comments 20
Comments on the PITCH Table 20
Comments on the GAIN Table 21
Comments on the INDEX7 Table 21
Comments on the INDEX6 Table 21
Comments on the INDEX5 Table 21
The PITCH Table 22
The GAIN Table 24
The INDEX7 Table 25
The INDEX6 Table 26
The INDEX5 Table 27
APPENDIX 2: IMPLEMENTATION RECOMMENDATIONS 28
REFERENCES 30
Cohen [Page ii]
NWG/RFC 741 DC 22 Nov 77 42444
Specifications for the Network Voice Protocol (NVP)
PREFACE
The major objective of ARPA's Network Secure Communications (NSC)
project is to develop and demonstrate the feasibility of secure,
high-quality, low-bandwidth, real-time, full-duplex (two-way) digital
voice communications over packet-switched computer communications
networks. This kind of communication is a very high priority
military goal for all levels of command and control activities.
ARPA's NSC projrct will supply digitized speech which can be secured
by existing encryption devices. The major goal of this research is
to demonstrate a digital high-quality, low-bandwidth, secure voice
handling capability as part of the general military requirement for
worldwide secure voice communication. The development at ISI of the
Network Voice Protocol described herein is an important part of the
total effort.
Cohen [Page iii]
NWG/RFC 741 DC 22 Nov 77 42444
Specifications for the Network Voice Protocol (NVP)
ACKNOWLEDGMENTS
The Network Voice Protocol (NVP), implemented first in December 1973,
and has been in use since then for local and transnet real-time voice
communication over the ARPANET at the following sites:
o Information Sciences Institute, for LPC and CVSD, with a
PDP-11/45 and an SPS-41.
o Lincoln Laboratory, for LPC and CVSD, with a TX2 and the
Lincoln FDP, and with a PDP-11/45 and the LDVT.
o Culler-Harrison, Inc., for LPC, with the Culler-Harrison
MP32A and AP-90.
o Stanford Research Institute, for LPC, with a PDP-11/40 and an
SPS-41.
The NVP's success in bridging the differences between the above
systems is due mainly to the cooperation of many people in the
ARPA-NSC community, including Jim Forgie (Lincoln Laboratory), Mike
McCammon (Culler-Harrison), Steve Casner (ISI) and Paul Raveling
(ISI), who participated heavily in the definition of the control
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