[asterisk-users] Convert a file from WAV to WAV49 or GSM for Asterisk

[Chris Carey]

I would like to convert a file to WAV49 for use with Asterisk using
the linux command line. Specifically I would like to upload sounds to
use for unavail.wav and busy.wav, but I'd like them to be compressed
so that space is not wasted.

I tried using SOX but havent found the correct command-line options to
make it or Asterisk happy.

Ideas?