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Specifications for the Network Voice Protocol (NVP) (RFC0741)

IP.com Disclosure Number: IPCOM000003788D
Original Publication Date: 1977-Nov-01
Included in the Prior Art Database: 2019-Feb-14
Document File: 35 page(s) / 35K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

D. Cohen: AUTHOR

Related Documents

10.17487/RFC0741: DOI

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 9% of the total text.

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 protocol; and John Markel (Speech Communications R...

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