As service providers transform their networks more and more to IP, they are taking on a new role that involves the orchestration of applications and content from multiple participants in the service delivery supply chain. This translates into multiple networks - both internal and external to service providers - for providing end-to-end services to customers. The multiplying capabilities and expanding capacities of Session Border Controllers (SBCs) have become central to this evolution to IP-to-IP interworking and can help service providers as they endeavor to improve performance and cope successfully with spiraling traffic volumes and complexity.