Chapter 10. Provider Architectures and Security
This chapter describes the logical components and network topology of various architectures currently used in service provider VoIP deployments. Carrier-grade VoIP architectures aim to provide a scalable, secure, robust, and interoperable network for residential and enterprise customers using standard mechanisms and protocols. Although this philosophy is claimed by many companies that provide VoIP services, some take a more mature approach to meet these objectives. The two issues that surface frequently are QoS and security, which also tend to be somewhat interrelated. If a network element (for example, SIP proxy) suffers from a vulnerability which can be used to cause a DoS (or a related Byzantine ...
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