According to consultancy Ovum, the estimated ring back market will grow to $2.4 billion by 2008. Perceptive Impression estimates that replacing music with advertisements would put that figure closer to $14 billion sooner than 2008.
Today, major telecoms like AT&T and Verizon have introduced ring back replacement with customized music. Kind of like a higher-end ring tone where the caller hears the music, not the person receiving the call.
References:
John Bonosoro, PromoTel Advertisment, The Economist, August 2001, USA
Olga Kharif, Telecom Tales, Business Week, 6 Sept 2004
Karl Seelig & Anita Erickson US Patent application # 20030086558, #20030002657
Unknown, Dialing-for-Dollars, Orange County Register, July 3, 2001
Ring Back Tones to Become Ad Channel, CellularNews.com Story 13889, Dated 8/29/05
Streetinsider.com/news, Dialing-for-Big-Dollars
Wirelessiq.info/co "Ring Back" Can Add Billions in Telecom Bottomline Revenue

