Convert NIST sphere format (SPH) to WAV

I’m looking for a program that can convert audio files from NIST sphere format (SPH) to WAV.

Any license, operating system and price is fine.

I tried SoX (Sound eXchange) (free, CLI, Linux):

sudo apt-get install -y sox
sox file.sph file.wav

but with some files (e.g., WSJ speech recognition corpus) I did the message:

sph: unsupported coding `pcm,embedded-shorten-v1.1′

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