intercepted call - can someone please explain?

I received a call from my husband this afternoon and ended up intercepting someone else's call.

It was a pocket dial from my husband's phone across the room that went to my Google data second line (not my cell number). Instead of hearing him or even the echo of myself, I heard a totally different person having one side of a conversation. I couldn't speak, though my husband could hear me on his phone.

Can someone explain what happened here? …

call privacy