Is it possible that my NTT landline is tapped ?

For the past few weeks whenever I call my sister’s cell phone back to my home country, she is puzzled since the number registering on her cell phone is always a different cell phone number. I always call her thru my NTT landline. Is my landline being hacked as I sometimes hear a small sound at the end just before my sister open the receiver?

by New_Tomato_959

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