Callers can't hear me!!

jm5119

    Most of the calls, the callers can NOT hear me BUT, most of the time I can hear them.
    Also, when I callback, again they can NOT hear me.

    VOIP calls are perfect, with voice crystal on both sides!

     

    The device is Lenovo K6 Power and the device is good, as it was working fine with earlier telecom service!

    So, what is happening here?

     

    Please help!

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