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EBU Standardisation of Audio Over IP for Contribution Systems
Audio over IP end units are increasingly being used in radio operations for streaming of radio programmes to and from studio sites. The IP networks used are often well-managed private networks with controlled Quality of Service. The open Internet is also more and more being used for radio contribution. Radio correspondents now have a choice to use either ISDN, or the Internet or managed IP networks to deliver their reports. ISDN services will be closed down in some countries. The European Broadcasting Union project ACIP has created an interoperability standard, which has been developed jointly by members of the EBU and manufacturers. The document, TECH 3326 , has since its publication quickly been implemented and used by more than 20 manufacturers worldwide for end units for streaming contribution over IP. Several plug tests have been made between manufacturers to enhance and confirm the standard. The requirements for interoperability are based on the use of RTP over UDP for the audio session and SIP for signaling. IETF RFC documents for commonly used audio formats in radio contribution define the packet payload audio structure. This document gives an overview of the standard and its applications in broadcasting.
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