Voice over LTE (VoLTE) is the first step for carriers to improve their capacity, accelerate their aggressive data services offerings, and position themselves for value-added services. The first step, however, is to ensure that infrastructure is in place to support VoLTE.
In our recent research report, Voice over LTE (VoLTE) Market Opportunities and Forecast 2013 – 2018, we uncovered some major impacts in carrier networks deployment requirements including Session Border Controllers (SBC), Voice Continuity equipment, and IP Multimedia System.
In the new LTE Radio and Evolved Packet Core (EPC) architecture, there is no circuit-switched domain to handle voice calls in the traditional 2G/3G way. There are many issues and challenges with 4G from a technology and operational perspective. One of those issues is spotty coverage. To manage this issue, VoLTE is dependent upon the Service Centralized and Continuity (SCC) Application Server.
The SCC is an IMS Application Server (AS) that provides functionality required to enable IMS Centralized Services and Service Continuity for multi-media sessions. The SCC AS is in the signaling path of Session Initiation Protocol (SIP) messaging and is the connection point for packet bearer media. When the target wireless device is crossing over into an area that does not have sufficient 4G/LTE coverage, the SCC AS manages hand-over to 3G for voice.
Voice over LTE (VoLTE) Market Opportunities and Forecast 2013 – 2018
IP Multimedia Subsystem (IMS) Applications: Moving Beyond Voice over LTE (VoLTE)