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Those are two different ways, sometimes you can use magnetic induction from a cable or just connect in with wires, tap the wireless with a wireless receiver, bug the room containing a phone with a separate bug. Many ways.

In the fifties the FBI wanted to bug a Chicago mob conference room; they didn't have a microphone so they asked the Army. The Army gave them a WWII surplus one as big as a pineapple. They installed it in the wall of the conference room and used it for many years. I read that in Roemer: Man Against the Mob, by William F. Roemer Jr.

7 posted on 03/04/2017 10:25:30 AM PST by \/\/ayne (I regret that I have but one subscription cancellation notice to give to my local newspaper.)

It was hidden behind a radiator. The Outfit figured out where it was, but rather than give the secret away they simply turned up the radiator, and drowned out their speech with clanking and hissing, when they needed to discuss something important...or just to toy with the Feds.

“The Outfit” by Gus Russo is a better read BTW.

22 posted on 03/04/2017 10:48:09 AM PST by M1903A1 ("We shed all that is good and virtuous for that which is shoddy and sleazy... and call it progress")