I don't know what kind of introduction you need, but the first that came to my mind is Kurosagi. There's a zillion telephone calls there, most of them business related, hence using keigo.
This is a part of it. The introduction is very brief and, as I said, business related. It starts at
minute 15.20.
http://www.dramacrazy.net/japanese-drama/kurosagi-episode-10/
The whole episode is about people talking on the phone and introducing themselves with the purpose of selling something.
I hope it helps. :)