Azure Communication Services (ACS) intermittently fails to play the expected event during calls. In these cases, the call times out, remains silent, and call recording does not start.

Issue Details:

The expected event is not triggered consistently by ACS.

When the issue occurs, the call is silent and eventually reaches a timeout.

Call recording is not initiated for the affected calls.

The issue is intermittent and does not occur on every call.

For example, out of 10 test calls, this issue occurs approximately 3–4 times, while the remaining calls function as expected.

Impact:

This behavior impacts call flow reliability, call recordings, and overall user experience.