The SIP protocol gains popularity for setting up temporary audio links over IP networks for broadcast applications. This paper briefly describes SIP and discusses its distinctive advantages, especially in comparison with proprietary systems.The main and obvious benefit is standardisation, which opens the way to interoperation between different makes of codecs.SIP, as a signalling protocol, readily provides efficient methods for link setups, while preserving ease of use. Now a mature technology in the VoIP field, it is supported by a wide range of network devices, and includes provision for specific issues like firewall or NAT traversal.Lastly, SIP should be the key to the transition from ISDN to IP networks, while providing at least as flexible operating modes.
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