General :: CM7 - How To Route Call Sound To Phone Speaker

How can I route Call sound to phone speaker on cm7 without using any Paid apps. My phones mic doesn't work and no mechanics were able to fix it. No HTC care or something is present in my city. I am able to use my phone with headphone mic. Now I want to fix the problem headphone mic to my phone but only problem is I need the sounds to come out of the phone speaker/sbox.

Basically :
My phone need to do this:
Headphone mic for voice input.
BUT outputs call sound through phone speaker or sound box.
I only need it during phone calls but all time is okay too.
I'm rooted, s off on cm7.2 drowning child's kernel, on the Intruder(At&t)
Version of the now low end phone HTC Aria.
It has a room choice of cyanogenmod 6 and 7.2 official, cm9,10 custom ported.