RFC 978 (rfc978) - Page 2 of 5

Voice File Interchange Protocol (VFIP)

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.