Eavesdropping or Phone Tapping?

Hi,

My Ooma setup is without a local landline, and I've been with the service now for 3 months. My wife keeps telling me that she hears someone else on the line (other than the intended call recipient) when she makes calls through our Ooma home phone set up. Specifically, light breathing noises and she has also mentioned that after the person she called hangs up, she waits a few seconds, the phone doesn't disconnect and that's when she can really tell someone else is on the line. Only after she asks if there's someone there does it click over.

She hasn't heard or read about any of the Distributed Termination routing and potential for eavesdropping (and I sure as hell didn't tell her because it would just make her more skeptical)

Just and FYI -- We don't have anybody else living in our house, so there's no one picking up any of our internal phones and listening in.

Personally, I haven't noticed it, but I travel 25 days a month so I have limited interaction with the system.Anybody have similar issues?

Any help will be apprecited.

I didn't find the right solution from the Internet.

References:

https://ooma.com/forums/viewtopic.php?f=6&t=1065

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Thank you.