RealNetworks has acquired Muzicall, a service provider for mobile carriers and media companies in Europe, best known for its ringback tone (RBT) platform. The size of the transaction was not shared.

Muzicall has been integrated into RealNetworks’ Mobile Entertainment division, which in partnership with carriers manages 18 million active global ringback tone subscribers.

Muzicall currently distributes a portfolio of apps, reaching more than 500,000 subscribers across Europe, says RealNetworks. The company’s carrier relationships in Europe include EE (Orange + T-Mobile UK), Virgin Mobile in the United Kingdom, Optimus in Portugal, Swisscom and Orange in Switzerland.

[Image courtesy: Muzicall]