Announcement file format requirements

Last Updated : Sep 28, 2023 |

To be compatible with the gateway v VAL source and Communication Manager, announcement recordings must have the following parameters:

  • CCITT A-Law or CCITT μ-Law compression format. Do not use PCM.

  • 8-KHz sample rate

  • 8-bit resolution (bits per sample)

  • Mono (channels = 1)

  • The μ-Law compression format is used in the United States, and A-Law compression format is used internationally. Use the compression format that is specified on the Location Parameters screen.

  • Filenames for the VAL announcement sources cannot contain blank spaces, nor any of the following characters:

    • Period (.)

    • Comma (,)

    • Colon (:)

    • Asterisk (*)

    • Question mark (?)

    • Less than (<)

    • Greater than (>)

    • Forward slash (/)

    • Backward slash (\)

    The filename itself is case sensitive, but the file extension .wav must be lowercase. Announcements that are recorded in this format occupy 8-KB per second of file space for each second of recorded speech. For example, a 10-second announcement creates an 80-KB .wav file.

    Do not type the .wav file extension for the file name in the Announcements/Audio Sources screen. The system does not display the .wav file extension on this screen.