Tapping noise when ringing somebody

Hello,
Quite often when I ring people, they can’t hear me at all and all they can hear is a tapping noise. Has anyone experienced this? It doesn’t happen always so I know it’s not the microphone and I don’t think it’s the network because nobody I know using the same network in the same area experiences the same problem. What would you suggest to solve this problem?
Thanks in advance!

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