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We've had this problem twice in the last couple months. We were forwarding calls after hours to an employee's cell phone (T-mobile). The callers were getting 2 rings (from RingCentral) and then a busy signal when it transferred to T-mobile network. Calling the employee's cell phone directly got thru every time, and even the forwarded RingCentral calls would get thru maybe 10% of the time. We found no resolution. I think in stressed times, the T-mobile network is dropping the RingCentral forwarded calls as potential spam / low priority calls.

We've had this problem twice in the last couple months. We were forwarding calls after hours to an employee's cell phone (T-mobile). The callers were getting 2 rings (from RingCentral) and then a busy signal when it transferred to T-mobile network. Calling the employee's cell phone directly got thru every time, and even the forwarded RingCentral calls would get thru maybe 10% of the time. We found no resolution. I think in stressed times, the T-mobile network is dropping the RingCentral forwarded calls as potential spam / low priority calls.