The actual audio streams are delivered by the BBC iPlayer within the UK. This uses Flash technology so requires flash to be installed on the local machine where the iPlayer is to be accessed. The BBC iPlayer can also be accessed over the Internet by a range of mobile devices including the IPhone and iPod Touch as well as some smart phones from Nokia, Samsung, and Sony Ericsson.
All the radio stations are broadcast at 128Kbps using AAC encoding with the exception of Radio 5, which is streamed at 80Kbps and Radio 3, the classical music channel which is broadcast at 192Kbps, which offers considerable potential improvements over the DAB streams which are encoded using the older MP2 codec. At the end of 2008, the quality was upgraded by the change from MP3 to AAC and by using direct and discrete feeds from the studios, separate from the DAB broadcast signals.