It may be gone soon, but read about Cisco’s:
“Cisco Multicast Hoot ‘n’ Holler over IP, powered with Cisco’s VoIP technology, transports hoot ‘n’ holler traffic over Cisco equipment. Hoot ‘n’ holler networks, are specialized audio conference networks most heavily used in the brokerage industry but also employed in utility, media, mass transit and other industries. Hoot ‘n’ Holler networks are used by brokerage firms to advise brokers on market movements. Brokerage firms can spend millions of dollars in monthly leased line charges to pay for dedicated circuit-switched hoot ‘n’ holler long distance connections.” […]
Edited to add: I thought this was a joke… a funny Easter Egg planted by the web group. But, no, under further analysis, it seems “Hoot & Holler” network is real?