I thought it was me bumping my keypad or even the person on the other end doing the same but today and in the past I have experienced what sounded like "touchtones" being generated during a conversation. I always blamed the other party (It seems to mosly happen on calls to my sister so I had no problem blaming her). Today I was talking with her and it happened again. This time we both put our phones on speaker and it happened yet again. Sometimes both parties hear it sometimes only one side. She is on Verizon POTS and I'm (obviously) on Voipo. It's really no big deal at all but I'm starting to get paranoid.

I looked outside but didn't see any black ops helicopters or guys up on the poles talking into their sleeves.

Anyone else ever experience this?