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The SIP Express Media Server, originally a media server to complement SIP based VoIP networks with services such as voicemail, conferencing and IVR services, with the introduction of a B2BUA and especially the SBC module can be useful as call stateful control element in the operator core, for specific applications, or as a full Session Border Controller. In upcoming SEMS 1.6, again a whole lot of useful functionality has been and will be added, among them registration handling, tcp stack and more NAT traversal options, transcoding, multiple interfaces, bandwidth limiting etc. Further, a new extended call control interface which even can be scripted with the super simple DSM state charts language not only supports more complex, PBX type call flows, but also makes SEMS a toolbox useful for most situation where a call stateful element is needed.
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