CSPs are transforming their voice and data services into next-generation software driven architectures by the using vCloud NFV platform. This chapter explores the voice telephony transformations discussing the considerations for physical, virtual, and VNF deployment design from an end-to-end perspective.
The telco voice services transformed to an all-IP packet switch transport with the deployment of LTE/4G networks. The IP Multimedia Subsystem (IMS) 3GPP specification is used as the common core fabric which is independent of the access network. This makes it possible to use the same telephony infrastructure for fixed, mobile, and WiFi access networks. The radio access network transformation to LTE is able to deliver the QoS necessary to deliver high-quality voice to mobile devices. The following figure is a conceptual view of the mobile network and IMS core used to illustrate an NFV transformation at a software-define data center.
