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Assets

Zuthree Manager allows you to provide additional assets to your phones, such as wallpapers or ringtones.

Phones pull asset lists on demand, ensuring they are always up-to-date. However, individual assets will not be updated automatically on the phone unless the user selects them. For instance, if you update a wallpaper in Zuthree Manager, the phone will continue to use the previously selected wallpaper until it is manually updated on the device.

Wallpapers

Images must not exceed 4MB in size.

The following image formats are supported: PNG, JPG, JPEG, and WEBP.

All images are automatically converted to the PNG format.

Ringtones

Cisco phones utilize Pulse Code Modulation (PCM) audio files, which contain raw, unprocessed audio data. Unlike common audio formats (like MP3 or WAV), PCM files lack metadata such as sampling rate and bit depth.

Requirements

  • Audio Format: Raw PCM (no header)
  • Sampling Rate: 8000 samples per second
  • Bit Depth: 8 bits per sample
  • Compression: mLaw
  • Ring Size:
    • Maximum: 16080 samples
    • Minimum: 240 samples
    • Must be evenly divisible by 240 samples
  • Zero Crossing: Ring must start and end at a zero crossing point.

Preparing your ringtone

This guide outlines the steps to convert your audio file into the format required by Zuthree Manager ringtones.

  1. Convert to WAV (Optional):

    If your audio file is already in WAV format, you can skip this step. Otherwise, you’ll need to convert it using audio editing software. We recommend using the free, open-source Audacity software.

    1. Download and install Audacity on your computer.
    2. Open your audio file in Audacity.
    3. Edit the audio as desired (trimming, fading, etc.).
    4. Export the edited audio as a WAV file. Ensure the “Export As” type is set to WAV during export.

  2. Install sox (if needed):

    The sox command-line tool is required for format conversion. If you don’t have it installed on your system, open a terminal window and run the following command:

    Terminal window
    sudo apt-get install sox

  3. Convert to raw PCM format:

    Open a terminal window and navigate to the directory containing your WAV audio file (use the cd command). Then, run the following command, replacing input.wav with your actual file name and output.raw with your desired output name:

    Terminal window
    sox input.wav -t raw -e u-law -b 8 -c 1 -r 8000 output.raw

    This command converts your WAV file to the required raw PCM format with the following specifications:

    • Unsigned 8-bit samples (-b 8)
    • Monochromatic (single channel) (-c 1)
    • Sampling rate of 8000 samples per second (-r 8000)
    • mLaw encoding (-e u-law)
    • Raw data format (-t raw)