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Seeking advice on how to make a rotary dial phone have a busy signal when answered

Hi all, I'm working on a Just For Laughs-type hidden camera prank show and I need to build a prop rotary dial phone that, when answered, has a busy signal. I would prefer, if possible, to hide any additional parts inside the body of the phone. Also, just a note, the phone doesn't have to ring.

If you have any advice I would love to hear!!!

Many thanks,

DAZU


Picture of Seeking advice on how to make a rotary dial phone have a busy signal when answered
damianzuch (author) 3 years ago
Hmmm, I just found this - http://cdn.makezine.com/make/2010/05/MAKE_ghostphone.pdf - which may be the answer. I love Instructables and MAKE and all you guys!