[asterisk-users] Which cause less CPU usage: GSM or wav??

[Thomas Kenyon]

Atis wrote:
> 
> A little caveat - "sox" doesn't understands file extensions used by
> asterisk (or it's just asterisk, trying to use file extensions that
> match codec name). So - some sox commandline hints:
> 
> ulaw: -t ul
> alaw: -t al
> slin: -t raw -s -w
> 
Or (since 1.4.0) in the asterisk cli type:

Convert /path/to/<filename>.wav /path/to/<filename>.ulaw