Regarding to the thread:
I think that there is a requirement for making a public C++ API to obtain Rx Quality or BER (Bit Error Ratio) value of GSM voice call signal. This is one of the best voice quality indicator !!! Signal strength is only half relevant to the voice signal quality. And I don't understand why the API is available on S60 v6.1 and it's not available on S60 v8.0a. And on v8.0a platform GPRS Residual BER and SDU BER can be obtained with public API but GSM signal BER not.
Please consider this requirement and thanks for any help.