| Audio files are not heard when calling into an application |
| Categories: Audium Call Services 3.4.x and 3.5 |
| Article ID: | 15 |
| Last updated: | February 18, 2007 |
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SUMMARY
This article explains why audio files might not be heard when calling into an Audium application.
SYMPTOMS
Developer has recorded audio files, placed them in the appropriate places for the voice browser to fetch them, but callers do not hear the audio files. Developer can hear them when played on the local machine.
RESOLUTION
The audio file format is most likely not supported by the voice browser.
Audio content to be used in phone applications must be converted to specific formats and sampling rates in order for it to be heard over the phone. Generally, most voice browsers require audio to be sampled at 8Hz (or 8-bit) and be mono, however platform specific documentation should be checked. Note that 8-bit mono audio files will have a lower sound quality than high bit stereo audio files. There are different encoding types that may or may not be supported by voice browsers such as "u-law" (pronounced "mu-law") or "a-law". u-law encoding tends to be the most common.
File types are independent of the above information, so there can be an 8-bit unsigned WAV file or an 8-bit u-law vox file. Each voice browser, however, has its own list of file types it supports. See the voice browser documentation for a complete list.
Keep in mind that WAV files can appear in multiple encodings and sampling rates, simply being able to hear the audio on a desktop system does not mean it will be heard over the phone (and vice versa).
If you have audio content in stereo and at a high sampling rate, various desktop sound programs (such as Goldwave) allow you to resample the audio to the correct formats. Audio recording companies that cater to phone applications (such as RightVoice) can deliver audio content in any format desired, including retaining original content in its high-bit form and resampling them for use in phone applications.
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