Andrei (MPI) wrote:
I am using wav format for prompts. I see no reason to use gsm or anything else, if disk space is not a problem.
The same as using ulaw if bandwidth is not a problem.
If your callers are coming in over PSTN connections, then you should store your prompts in ulaw (.ul) or alaw (.al) files. There is no value in storing them in any WAV-type format at all, since Asterisk will still have to translate them. Realistically, though, you should store all your prompts in every format your callers are likely to use: Asterisk will choose the "best" format to play back when it is needed.
sox does an excellent job of converting the Digium-supplied GSM files into ulaw files. Obviously the sound quality does not improve (without access to the original uncompressed material), but it saves a small amount of CPU time on the server doing the playback.
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