Troubleshoot Teams Telephony One-Way Audio Issue

I'm experiencing a frustrating one-way audio issue with Teams telephony configured via Direct Routing through an AudioCodes SBC. When I call external numbers, the recipients can hear me, but I cannot hear them. This problem has persisted across all tested external numbers. Ideal Skills: - Extensive experience with Microsoft Teams and its telephony features - Proficient in Direct Routing configurations - Familiar with AudioCodes SBCs - Strong troubleshooting and problem-solving skills Your task will be to diagnose the root cause of this issue and implement an effective solution.