Scalable Session Border Control Capabilities for Service Provider Networks
by Cisco Systems
Published September 2005; Posted January 2006




Voice over IP (VoIP), video streaming, instant messaging, and gaming are just a few of the real-time, IP-based applications enjoying rapid growth in today's competitive telecommunications market. Service providers must find ways to efficiently and economically interconnect their IP equipment to both their customers' and other service providers' IP networks.


Session Border Controllers (SBC) have been introduced to replace the back-to-back media gateway pairs and allow native IP interconnects between VoIP networks. The increased number of functions promised by IMS is placing greater demands on SBCs to manage more than just voice.


Today's SBCs must allow operators to scale a wide range of applications over networks whose peer connections are increasing in size, number, and type (for example, service provider-to-service provider, or service provider-to-enterprise). SBCs must also provide comprehensive network security. Operators must honor SLAs with peers and customers, as well as regulatory directives regarding lawful session interception. This paper examines some important considerations for service providers looking to deploy session-border-control (SBC) capabilities in their networks.



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