aacPlus is a highly efficient audio coding scheme which is capable of providing very good audio quality at low bit rates. Color ring back tone services provide a music experience while waiting for a called person to answer the phone, replacing the traditional beep sound ring tones. These services have been commercialized since 2002 but some audio quality issues remain as the existing speech codecs are being used to code music. With the increasing availability of aacPlus on mobile phones it becomes possible to use aacPlus for this kind of application and it will be the core component of new premium color ring back tone services. The new service will provide significantly improved audio quality which allows for an excellent user experience with music ring back tones. The basic parameters and extensions to adapt the aacPlus codec to the transmission channel are described. Simulation and subjective listening test results are also presented in this paper.
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