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As telecommunications has moved from proprietary to open, standards-based systems, advanced voice solutions have grown richer and more cost effective. Several basic telephony concepts are critical to working with these solutions: call control, media processing, in-band and out-of-band signaling, and local, dedicated first-party control versus shared, network-based third-party control. Once these concepts are understood, today?s modular, converged, and increasingly Web-centric communications technologies become easier to understand.
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