At a recent conference I attended, a strategy executive at Deutsche Telekom stated that they would turn off the 3G network before turning off 2G GSM as the migration to LTE evolves. Sounds bizarre? Not really, it makes a lot of technical sense. One reason to come to this decision is the nature of the LTE architecture and the way LTE handles voice traffic. As a full-packet network, LTE is fundamentally different from the full circuit-switched GSM and hybrid circuit and packet-switched 3G networks which include today’s data workhorse HSPA+. In LTE, voice is just another application, albeit one with specific parameters and requirements. Therefore, voice is packetized and classified according to a certain Quality of Service level (QoS) to maintain important parameters such as latency and jitter. This is essentially what Voice over LTE (VoLTE) is.