Filter gsm buzz noise effect on audio amp

The gsm buzz noise (217 hz tdma?) Is a popular side effect of cell phones on audio amplifier devices.
Im trying to use the tda1308 module which has the following circuit :

But during of incoming call the noise gets loud enough to distort real audio completely.

How shall i remove or attenuate the noise. Im looking for a schematic with certain value per components (cap, conductor,ferrite beads, etc...)

Tnx

Im looking for a schematic with certain value per components (cap, conductor,ferrite beads, etc...)

When it comes to tracking down RF interference you will not get that, just suggestions.

First make sure all 0.1uF capacitors are ceramic, and add the. Across R1 and R2.
Next try making the input impedance of that differential amplifier lower. You could do this by putting a resistor to ground between C7 and R5 with the same for C6 and R3. Then put a small capacitor say 100pF ceramic across that resistor. You will have to experiment with the values of this resistor as it will be a compromise between suppression and lack of volume.

Finally you could consider screening with a metal box and using feed through capacitors for all signals in and out.

You could do this by putting a resistor to ground between C7 and R5 with the same for C6 and R3. Then put a small capacitor say 100pF ceramic across that resistor.

No, that will upset the bias. You need to swap positions of C7 / R5, so that the DC bias isn't affected by the
new resistor - actually I'd just add 100pF to 1nF of ceramic cap direct to ground on the input node, to
short RF to ground.

Putting the amp in a metal box to screen it is the most important thing you need to do though,
its completely at the mercy of RF fields otherwise.