@Arijitb -No there is no such thing. What I can add to enable hand free phone facility?
If you really need Hands Free function other than replacing your HU are below
1. Invest in stand alone In-Car Hands Free device - Which Got In-Built Battery + Mic + Small Speaker and Clip Mounting Mechanism of such which help user to put the device on Dash Board / Sun Visor / AC vents etc..but the down side is the battery - You need to charge it sometimes.
2. Other is AUX IN based system - This thing work with your Car's HU - No need for charge or anything - Taking Power from your Car 12v Cig Lighter but it occupy your AUX IN port as long as you want to use the device / wants Hands Free function. Usually this kind of system let you stream Music / Media from your smart phone or Bluetooth Enable phone.....Only Downside is you can't Switch your HU to Radio or USB mode - You loose the Hands Free Function...Your only in-car entertainment during usage of the product is your smart phone's media library. That's it.
One of such example is this :-
Kinivo BTC450 Bluetooth Hands-Free Car Kit for Cars: Amazon.in: Electronics
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