This read-only value reports the measured round-trip delay, in milliseconds, from the most recent delay test triggered via bbChanTestType set to testdelay. It gives an admin a concrete latency figure for a specific connection, useful for validating SLA delay commitments or diagnosing performance complaints. If a customer reports poor voice quality over a PVC, an admin could run a delay test and check bbChanTestResult to see whether excessive round-trip delay explains the problem.