. . "23444746"^^ . . . . . . . . . . . "Ringback tone advertising"@en . . . . . . "1045782602"^^ . . . . . . . . . . . . . . . . "RingBack Tone Advertising, or RBT-Ads (also known as RingBack Advertising, Ad RingBack, Ad-RBT, AdRBT, Voice Ads, or Biz-Ring), replaces the Ringback tone period, or standard acoustic signal a caller hears that indicates the called phone is ringing, with advertisements or other promotional messages. Wireless carriers, calling cards, infrastructure vendors, ad networks, media agencies and free information services offer RBT-Ad space to advertisers, brands and agencies, making it possible for mobile service providers to monetize this inventory of ad space and in turn offer free or very inexpensive wireless services to consumers and subscribers."@en . . . . . . . . . . . . . . . "RingBack Tone Advertising, or RBT-Ads (also known as RingBack Advertising, Ad RingBack, Ad-RBT, AdRBT, Voice Ads, or Biz-Ring), replaces the Ringback tone period, or standard acoustic signal a caller hears that indicates the called phone is ringing, with advertisements or other promotional messages. Wireless carriers, calling cards, infrastructure vendors, ad networks, media agencies and free information services offer RBT-Ad space to advertisers, brands and agencies, making it possible for mobile service providers to monetize this inventory of ad space and in turn offer free or very inexpensive wireless services to consumers and subscribers."@en . . . . . . . "6868"^^ .