André Perez 
Voice over LTE [EPUB ebook] 
EPS and IMS Networks

Voice over LTE (Long Term Evolution) presents the mechanisms put
in place in 4G mobile networks for the transportation of IP packets
containing voice data and telephone signaling, as well as the
technologies used to provide a telephone service in the IMS (IP
Multimedia Sub-system) network.
Despite the difficulty connected to the handover of the 4G network
to the 2G/3G network, a telephone communication will not be
established on the 4G network. This book analyzes the technologies
that have been put in place, such as CSFB (Circuit Service
Fall Back), an interim solution that enables a mobile connected to
the 4G network to receive an alert transmitted by the 2G/3G
network.
The book also goes on to develop the SIP (Session Information
Protocol) on which the telephone signaling transferred by the 4G
network is based, the IMS network that provides the service and
defines the routing, the SRVCC (Single Radio Voice Call Continuity)
mechanism that maintains communication and the TAS (Telephony
Application Server) that supplies supplementary services.
Contents
1. The EPS Network.
2. The LTE Interface.
3. The CSFB Function.
4. SIP and SDP Protocols.
5. The IMS Network.
6. Telephone Services.
7. The SRVCC Function.
About the Authors
André Perez is a consultant and teacher in networks and
telecommunications. He works with industrialists and operators
regarding architecture studies and leads training on the 4G and IMS
networks for NEXCOM.

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