We didn't have those failures, though we took call manager, IM&P, and unity connection to 11.5 and UCCX to 11.0.1 several weeks ago. If I had to guess, that seems like more of a licensing failure, because TAC even tried replacing our license. But we are at a loss what could be causing this problem. We rolled back and are on 10.5 working fine. And then rolling forward again to 11.5 the system worked great again - but only for 4 hours. It was a total unmitigated Cisco disaster. Primary down, Secondary Down, and TAC was unable to resolve after hours and hours. Our entire contact center, which is HA, was entirely down. Failing over to the secondary would fix the issue for a few minutes, but then fast busy. The real shocker was 4 hours later when the system stopped accepting calls and just handed out fast busys. While minor, it's still not mentioned in the release notes. The upgrade went fairly smooth, and we hit a finesse bug which required the ECDSA COP file. The deployment was HA, and we didn't see much risk. We recently attempted to upgrade UCCX 10.5 - > 11.5.
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