Audio over IP end units are now common in radio and TV operations for streaming programmes over IP networks. The units are used to create contribution circuits from remote sites or local offices into main studio centres. The IP networks used are usually well managed corporate networks with good Quality of Service (QoS) and usually high bandwidth. Due to its availability, the Internet is also increasingly used for various cases of radio and television contribution, especially over longer distances. However, the use of high bit rates and reliable contribution transmissions over the Internet can not be guaranteed. Correspondents have the choice in their equipment to use either ISDN or the Internet to deliver their reports. More than 20 manufacturers now provide equipment for audio over IP applications. The EBU has issued and verified a standard, EBU TECH 3326-2007, which allows for interoperability between previously not compatible Audio over IP codecs. A plug-test between nine manufacturers held in February 2008 proved that earlier incompatible units now can connect according to the new standard.
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