SRVCC moves a VoLTE call to which domain?

Interview
1

Q. SRVCC moves a VoLTE call to which domain?

a) WiFi
b) Satellite
c) 5G NR SA
d) Circuit switched 3G/2G

Check 🔎

:arrow_right: Correct answer: Letter d.

Single Radio Voice Call Continuity (SRVCC) enables seamless handover of a VoLTE call from the IMS domain (over LTE) to the Circuit Switched (CS) domain (3G or 2G) when LTE coverage degrades or is lost.

This is essential for maintaining voice continuity in areas with limited LTE coverage, by allowing the ongoing IMS-based VoLTE session to transition into a legacy CS voice call using either UMTS or GSM.

Option Analysis:

a) :x: WiFi
→ Incorrect. Handover to WiFi is not SRVCC — it involves VoWiFi/IRAT techniques, not CS fallback.

b) :x: Satellite
→ Incorrect. SRVCC is defined only for handover to terrestrial CS networks (3G/2G), not satellite.

c) :x: 5G NR SA
→ Incorrect. 5G SA uses IMS for voice, not CS domain. SRVCC is about IMS to CS, not 5G SA.

d) :white_check_mark: Circuit switched 3G/2G
→ Correct. This is the target domain in SRVCC when VoLTE coverage drops.

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