Ringback Music
Also known as caller tunes in some parts of the world (like India), ringback music is a service offered by mobile network operators which enables subscribers to set music or even personalized recorded sounds as ringback tones.
Early versions of personalized ringback tone systems have been invented by a couple of inventors, Kang-seok Kim (Korean patent 10-1999-0005344), Mark Gregorek et al. (U.S. 5,321,740) and Neil Sleevi (U.S. patent 4,811,382). The first functional ringback tone replacement system was invented by Karl Seelig et al. (U.S. patents 7,006,608 and 7,227,929). In 2001 Seelig's prototype was described in the Orange County Register and the Economist Magazine kick starting the world wide development of ringback tone replacement.
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