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We had the exact same error, but the call was from PSTN to UCM and Unity Connection. The Unity Call Handler was playing the greeting then transfering the call to operator extension. However, the call was not transfering, nor dropping, but hung on dea...
We were experiencing the same problem. Calls being dropped after 20 seconds. And also had the same call termination code: Reason: Q.850;cause=86 Problem was solved by rebooting both of our voice gateways. It seems the CPE had a few seconds power fail...