Are these calls handsfree? If so either the caller or the called party, or both, do not have full duplex phones which causes this type of issue when background noise cuts out the talk path on the other phone.
The other thing to think about is that this issue may be at the other end of the call and not you. See if you can get an idea of who they are calling when this happens, there may be a common denominator outside of your building.
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