A monument to all our sins. Decommissioned 12/17/2014.
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http://forum.xda-developers.com/general/general/change-voice-call-android-phone-t2880821Uses a computer though. I think the problem with an app being available is that it's not legal at all. I don't know if there is any app available through a grey/dark market though. Definitely not going to be on Google Play.
it encodes in realtime, but doesn't specify whether it'll work on-call