Chapter 18. Cisco Multiservice IP-to-IP Gateway
One of the latest buzzwords in Voice over IP (VoIP) infrastructure deployments is Session Border Controller (SBC). As VoIP deployments move from individual islands of voice networks to end-to-end voice solutions, SBCs become a crucial infrastructure device that sits on the border of two networks handling real-time voice and video sessions. Before SBCs, service providers implemented back-to-back time-division multiplexing (TDM) gateways when interconnecting with other service providers. They were able to create points of demarcations between the networks, but because of the involvement of the digital signal processors (DSP), not only was delay being introduced, but also degradation in the voice/fax ...
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