Voice Service Options in 4G and 5G Networks

Voice Service Options in 4G and 5G Networks

In 2G/3G era: CS Voice

CS Core provides CS voice solutions for subscribers in the 2G/3G network.

In 4G era: VoLTE, CSFB and SRVCC

In the 4G all-IP era, Voice over Long Term Evolution (VoLTE) provides an IP-based voice service directly through the IMS and LTE network.
While with a view to ensuring the continuity of voice services in various phases of 4G network deployments, Circuit Switched Fallback (CSFB/CS Fallback) and Single radio voice call continuity (SRVCC) alike interim voice solutions are introduced in the 4G network. Here are a brief introduction to CSFB and SRVCC:
CSFB: If a UE is camped on LTE but it does not support VoLTE, it needs to perform a CSFB to initiate a voice call. CSFB is a mechanism that sends the user from 4G to 2G/3G (CS RAT) where it can successfully complete a CS Voice Call.
SRVCC: It provides a solution for handing over VoLTE (Voice over LTE) to 2G/3G networks. To make it interoperable with existing networks, these calls are to be handed over to Circuit switched calls in GSM/WCDMA networks.

Voice Services in 5G networks

· In 5G NSA network: VoLTE, VoNR, EPS fallback
In the initial phase of 5G deployment, to ensure user experience in voice and data, large-scale commercialization of 5G needs to be premised on a complete VoLTE network.
With the 5G NSA network framework, VoLTE can be achieved by connecting with EPC and eNodeB; VoNR can be achieved by connecting with EPC and gNodeB.
Evolved Packet Switched Fallback (EPS FB/EPS fallback) enables 5G phones to use the 5GC with NR for all data traffic, but RAN may trigger moving the phone connected to EPC, which is the best option to redirect the 5G devices from 5GC to EPC to make a VoLTE call in the transitory stage.

Voice Services in 5G networks

IPLOOK’s Converged 5G-oriented Voice Core Solution

To simplify the Voice Network and improve O&M efficiency, IPLOOK’s Converged Voice Core solution integrates multiple voice networks and allows all types of subscribers (2G/3G/4G/5G/fixed-line) to access an agile and efficient all-in-one voice network, delivering high-quality 5G voice services. It also supports operators and enterprises to meet a variety of voice application scenarios.

IPLOOK’s Converged 5G-oriented Voice Core Solution

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IPLOOK Technologies

IPLOOK Technologies

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A leading software company of 3G/4G/5G core network with flexible development, customized services and end-to-end mobile core solution.