Paper - Hierarchical Inter-CMS Architecture Using Standalone SIP Route Proxy

Hierarchical Inter-CMS Architecture Using Standalone SIP Route Proxy (2006)

By Rupal Desai and Rob Kissell, Cisco Systems, Inc.

Cable multiple service operators (MSOs) are rapidly ramping up their VoIP subscriber base. As they deploy regional Call Management Servers (CMSs), they also deploy costly interconnects with the PSTN for routing calls either to another CMS or to the PSTN. A hierarchical inter-CMS architecture using a standalone SIP route proxy enables MSOs to avoid the unnecessary PSTN interconnection costs and gives them flexibility to deploy CMSs regionally in a way that best utilizes their network resources. This paper will discuss the role of a SIP route proxy in interconnecting CMSs, media gateway controllers (MGCs) and peer VoIP providers and illustrate the business case behind deploying one such architecture.

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