Need to export as a 8 bit, 8 khz, PCM mu-law WAV file

I have an MP3 that I need to export as a 8 bit, 8 khz, PCM mu-law WAV file (it's for a phone system that is kinda old).
I've found programs that will do mu-law but not at 8 bit, etc. Quicktime will do the 8 bit and 8 khz WAV, but not PCM mu-law (it only does linear). Ironically, Mu-law (u-law) is an option for sound compression for AVI, but not WAV. It's there. I just need to know how to tap into it.

alaw and ulaw are commonly used in telephony systems, such as VoIP. For example we record voice messages - such as welcomes, prompts or instructional and progress - in natively support format for Asterisk in alaw.
Here is a wiki link for your convenience http://en.wikipedia.org/wiki/G.711
iMac (Intel)   Mac OS X (10.4.8)  

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