Int 2F Fn DB21  - Zyxel Zfax V3+ - Send Voice                              [F]

   AX = DB21h
   DS:SI -> filename including path (max 128 characters)
   DS:BX -> remote phone number

Return: AX = status (see #2768)

See Also: AX=DB11h,AX=DB20h,AX=DB22h,AX=DB23h,AX=DB24h