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TLS Alert: Level: Fatal Descriptio: unknown CA

in Acme Packet (MOSC) 3 commentsAnswered

Hello,

Starting today we see that TLS session with Microsoft Teams are failing.
I see in the network traces that the SBC sends a Alert to Miscrosoft (Level: Fatal, Description: Unknown CA).

Sometimes calls are working, sometimes not. If I'm missing a CA certificate, how can I determine which one?

I checked our certificate records: every root certificate which is required by Microsoft is installed on our SBC (from list ).

I enabled SIP debug, but I don't see handshake errors, I only see them coming into service and then out of service every minute, for example:

Jul 2 10:16:49.394 SA sip2.pstnhub.microsoft.com[Peer_112_Teams]PING TRANSACTION TIMEOUT to 52.114.132.46

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