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SRVCC

Single Radio Voice Call Continuity (SRVCC) is a technology that ensures uninterrupted voice calls when a user moves between different types of radio access networks, such as from LTE (4G) to 3G or 2G networks. This is particularly important for maintaining call quality and preventing drops when transitioning between areas with varying network coverage.

How SRVCC Works:

  1. Voice over LTE (VoLTE):
    • Initial Setup: The voice call is initially set up over the LTE network using the IP Multimedia Subsystem (IMS).
    • Handover Trigger: When the user moves out of LTE coverage, the network detects the need for a handover to a 3G or 2G network.
  2. Handover Process:
    • IMS Management: The IMS core network manages the handover process.
    • Seamless Transition: The call is seamlessly transferred to the circuit-switched domain of the 3G or 2G network without dropping the call.

Benefits of SRVCC:

  • Seamless Call Continuity: Ensures that voice calls are not interrupted during network transitions.
  • Enhanced User Experience: Provides a consistent and reliable voice service, even in areas with limited LTE coverage.
  • Efficient Network Utilization: Balances the load by transferring calls between different networks, reducing congestion.

SRVCC is a critical feature for mobile operators to provide high-quality voice services across different network types, ensuring that users experience minimal disruption during their calls.

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