Delivery of Voice and Text Messages over LTE
Christopher Cox · 2012
This chapter discusses two main approaches to the delivery of voice over long term evolution (LTE), both of which can be implemented in two ways. The first approach is to treat voice like any other data service and to deliver it using a voice over IP (VoIP) server that lies outside the LTE network. It can be implemented either by a third party service provider, or by a separate third generation partnership project (3GPP) network known as the IP multimedia subsystem. The second approach is to connect the LTE to the circuit switched domains of 2G and 3G, and to use their existing capabilities for placing voice calls. It can be implemented using two other techniques, which are known as circuit switched fallback and voice over LTE via generic access. Controlled Vocabulary Terms Internet protocol multimedia subsystem; internet telephony; IP networks; long term evolution