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Most calls with Teams Direct Routing become one way audio
I am having this issue with Audiocodes SBC but its after 15 min. Wondering if you were able to find a fix? jguel
Determined it was a firewall issue - the firewall engineers could not figure out why it was happening but it was definitely firewall. Why it was so intermittent for us though I don't know. Way I figured that out was convinced the network guys to instead of NAT'ing the IP and Interface that was connecting to Office 365 was to not NAT it and assign the public IP directly to that interface and put it on the outside so it bypasses the firewall completely. Once this was done everything worked. Since that fixed the issue I convinced them to just leave it like that as the SBC has it's own ways of mitigating unauthorized access attempts.
We were using fortigate firewalls if that helps. If you are having this issue and you are using a NAT try what I did and see if it fixes the problem.