dhesskew

I have a mystery on my hands. I have a 2007 CLK 350 Cabriolet prewired for phone. I bought everything I was told I needed. I installed it myself. Looked pretty simple and straightforward. Afterward everything seemed to work fine except no one can hear me. My Mbrace system is working including microphone. I tried using a different phone with no luck. reseated and re paired the Bluetooth puck numerous times. Everything is brand new. Went thru a bunch of threads and cant seem to figure out why I don't have microphone sound for my iPhone 5. Do I need an extra fiber optic cable to use the Mbrace Microphone? Can anyone offer any suggestions. Thanks.