Can't receive call after 1 May security patch update on Galaxy S9+

[Bhanu]

Hi All, My Samsung galaxy S9+ has become useless for calls after updating software to Security patch level 01 May 2019 today. Patch version G965FXXU4CSE3 / G965FOTF4CSE1 / G965FXXU4CSE1. Can hear calls, but when press/slide receive button then it disconnects., though call is still showing active at caller end. 

Any help please?

[Lykia]

Hey try this:
Settings》Apps》3 dots upper right corner》show sytem apps》phone app》storage》clear data.

[Bhanu]

Update: The issue is resolved now.

The problem was that, after software update or through other setting changes the VoLTE/ 4G calling was switched on. I went to setting and turned off VoLTE calling. That resolved the issue.