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+   Network Working Group                            J. K. Reynolds (ISI)
+   Request for Comments:  978                   R. Gillmann (Inner Loop)
+                                            W. A. Brackenridge (Alembic)
+                                               A. Witkowski (Inner Loop)
+                                                         J. Postel (ISI)
+                                                           February 1986
+
+   
+                 VOICE FILE INTERCHANGE PROTOCOL (VFIP)
+   
+
+STATUS OF THIS MEMO
+
+   This memo describes a proposed voice file interchange format for use
+   in the ARPA-Internet community.  Suggestions for improvement are
+   encouraged.  Distribution of this memo is unlimited.
+
+1.  INTRODUCTION
+
+   The purpose of the Voice File Interchange Protocol (VFIP) is to
+   permit the interchange of various types of speech files between
+   different systems.  Currently, there are many different types of
+   voice implementations, but no specific standard has been set with an
+   eye towards compatability between these systems.  With the increasing
+   interest and development of voice, specifically in Multimedia Mail,
+   there is an increased need to include standardized speech into a
+   common data structure.
+
+   The Voice File Interchange Protocol defines a header to describe the
+   voice data.  The 18-byte header contains the identifier, the header
+   version number, the header length, a DTMF mask for Touch-Tones, the
+   recording rate in bits per second, the total time in deci-seconds
+   (tenths of a second), and the encoding/recording method (see
+   Figure 1).
+
+2.  THE VOICE FILE INTERCHANGE PROTOCOL HEADER
+
+   The Voice File Interchange Protocol header is organized as follows:
+
+   2.1  The Header Version Number
+
+      The version number is 1-byte.  This first version is number one.
+
+   2.2  The Header Length
+
+      The length is a 1-byte field indicating the length of the entire
+      header in bytes.  For this first version, the length is
+      18 (bytes).
+
+
+
+
+
+
+Reynolds, et al.                                                [Page 1]
+
+
+
+Voice File Interchange Protocol                                  RFC 978
+
+
+   2.3  The DTMF Mask
+
+      This field describes what is known about DTMF Touch-Tones in the
+      data.  The field consists of a 16 flag bits which indicate what is
+      known about particular DTMF tones.  The 16 possible DTMF tones, in
+      order, are:  0 1 2 3 4 5 6 7 8 9 # * A B C D.  The low order bit
+      of the field is tone 0.
+
+      A 1-bit signifies that the corresponding tone is guaranteed NOT to
+      be in the speech file.  A 0-bit signifies that it may or may not
+      be in the speech file.  Therefore, a field of 16 zeros denotes
+      that nothing is known about the tones.  A field of 16 ones denotes
+      that there are no tones in the file.
+
+   2.4  Recording Rate
+
+      The recording rate is a 32-bit field and is the approximate rate
+      in bits/second of the method used to record the speech.  For
+      variable rate methods, this may be very approximate.
+
+   2.5  Total Time
+
+      A 32-bit number indicating the total time of the recording in
+      deci-seconds.  For example, 600 indicates 1 minute of speech.
+
+   2.6  Methods of Encoding/Recording
+
+      This 6-byte ASCII field indicates the method of
+      encoding/recording.  Names shorter than six characters are padded
+      out to the right with blanks (the ASCII space character, code 32
+      decimal).  For comparisons, the names are case insensitive.
+
+      Some known methods of Encoding/Recording are:
+
+        TI - The Texas Instruments card for the IBM PC [5].
+
+        IBM - PC Voice Communications Options.
+
+        NVP-1 and NVP-2 - Network Voice Protocol [1,2].
+
+        COMPUT - Computalker card for the IBM PC [4].
+
+
+
+
+
+
+
+
+
+
+Reynolds, et al.                                                [Page 2]
+
+
+
+Voice File Interchange Protocol                                  RFC 978
+
+
+3.  SUMMARY
+
+   This 18-byte header will permit interchange of speech files between
+   different systems, as well as facilitate automatic conversion between
+   formats.  The header does not have to be prepended to the speech file
+   proper; it may be in the form of a separate associated file, if that
+   is more convenient.
+
+                   <------------16-bits------------>
+                   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+                   |    Version    |      Length   |
+                   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+                   |             -DTMF-            |
+                   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+                   |          -Recording-          |
+                   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+                   |             -Rate-            |
+                   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+                   |            -Total-            |
+                   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+                   |             -Time-            |
+                   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+                   |       M       |       E       |
+                   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+                   |       T       |       H       |
+                   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+                   |       O       |       D       |
+                   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+                                Figure 1
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+Reynolds, et al.                                                [Page 3]
+
+
+
+Voice File Interchange Protocol                                  RFC 978
+
+
+4.  EXAMPLES
+
+   Example 1 is for one minute of 2400 bps NVP-2 speech.  Nothing is
+   known about DTMF tones in the data.
+
+                   <------------16-bits------------>
+                   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+                   |       1       |      18       |
+                   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+                   |               0               |
+                   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+                   |                               |
+                   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+                   |              2400             |
+                   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+                   |                               |
+                   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+                   |              600              |
+                   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+                   |       N       |       V       |
+                   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+                   |       P       |       -       |
+                   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+                   |       2       |      <sp>     |
+                   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+                                Example 1
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+Reynolds, et al.                                                [Page 4]
+
+
+
+Voice File Interchange Protocol                                  RFC 978
+
+
+   Example 2 shows the header for 10 seconds of 1200 bps TI speech, with
+   none of the DTMF tone 0-9 in the data, but no information about
+   tones *, #, A-D.
+
+                   <------------16-bits------------>
+                   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+                   |       1       |      18       |
+                   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+                   |              1023             |
+                   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+                   |                               |
+                   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+                   |              1200             |
+                   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+                   |                               |
+                   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+                   |              100              |
+                   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+                   |       T       |       I       |
+                   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+                   |      <sp>     |      <sp>     |
+                   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+                   |      <sp>     |      <sp>     |
+                   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+                                Example 2
+
+REFERENCES
+
+   [1]  Cohen, Danny, "Specifications for the Network Voice Protocol
+        (NVP)", RFC 741 (NIC 42444), USC/Information Sciences Institute,
+        January 1976.
+
+   [2]  Cohen, Danny, "A Network Voice Protocol (NVP-II)",
+        USC/Information Sciences Institute, April 1981.
+
+   [3]  O'Leary, G. C., "Local Access Area Facilities for Packet Voice",
+        MIT/LL, October 1980.
+
+   [4]  Computalker, "Compu Phone for the IBM PC/XT", Santa Monica,
+        California, August 1985.
+
+   [5]  Texas Instruments, Inc., "The TI Speech Application Tool Kit
+        Guide", TI Part #2232384-1, May 1985.
+
+
+
+
+
+
+
+Reynolds, et al.                                                [Page 5]
+