Call flow, different between SRVCC and CSFB

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Accepted Answer

SRVCC and CSFB are call flow procedures used in mobile networks for voice calls.

SRVCC stands for Single Radio Voice Call Continuity and CSFB stands for Circuit Switched Fallback.
SRVCC is used in LTE networks to handover voice calls from LTE to 2G/3G networks seamlessly.
CSFB is used in LTE networks to fallback voice calls to 2G/3G networks when LTE is not available.
SRVCC involves transferring an ongoing voice call from LTE to 2G/3G without interrupting the call.
CSFB involves initiating a voice call on LTE and then switching to 2G/3G for the actual call.
SRVCC requires support from both the LTE and 2G/3G networks.
CSFB requires support from the LTE network and the device being used.