You're most likely using a KitKat rom from here. I had the same problem. It's because the microphone was set to digital in the rom I got. Get a build.prop editor, find microphone, and change it from 'digital' to 'analog'. Works perfectly for me now.
Think all KitKat roms (for this phone) suffer from low call volume. So I patched in a 'Sitar' file and the call volume became as loud as the speakerphone. But now my callers were complaining about severly distracting echo. So I uninstalled the patch, and patched in a build.prop posted here. Everything seems to normal now.
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