Guardian Telecom
VoIP Telephones
Setup & Configuration
Page 25
9.6.1.
User-created Audio Files
User created audio files should be saved in the following format:
RIFF (little-endian) data, WAVE audio, Microsoft PCM, 16 bit, mono, 8000 Hz
You can use the free utility
Audacity
to convert audio files into this format. See Figures 8 through Figure 10.
You may download the application at
https://creativecommons.org/licenses/by/3.0/
Figure 8 - Audacity 1
Figure 9 -
Audacity 2