The 3rd Generation Partnership Project (3GPP) architecture has introduced a subsystem known as the IP Multimedia Subsystem (IMS) as an addition to the Packet-Switched (PS) domain. IMS supports new, IP-based multimedia services as well as interoperability with traditional telephony services. Voice Over LTE (VoLTE) is the technology to provide Voice service over LTE, However, not […]

The Call Session Control function (CSCF) is the heart of the IMS architecture and is used to process SIP (Session Initiation Protocol) signaling. The main function of the CSCF is to provide session control for terminals and applications using the IMS network. Session control includes: The secure routing of the SIP messages. Monitoring of the […]

Voice over LTE, or VoLTE is a GSMA profile of the standards defined for the delivery of services currently provided via Circuit Switch networks – mainly voice and SMS – over the Packet Switched only network of LTE, leveraging the core network IP Multimedia Subsystem (IMS). When mobile networks deploy LTE radio access technology, conformity […]

VoLTE is the all-IP method that tightly links the voice application to the LTE network to assure the best subscriber experience in terms of performance, reliability, interoperability and global roaming. The Value of VoLTE It integrates voice with 4G LTE to ensure the critical reliability and quality of that voice service. It ensures subscribers continue […]

VoLTE Call Flow: Turing on the VoLTE-enabled devices (e.g., smartphones) connects it to the LTE network infrastructure. Then, two default EPS bearers are assigned – one for SIP signaling with a non-GBR QCI value of 5 and the other for the LTE network with a non-GBR QCI value (from 5 to 9). The QoS Class […]