I am running 7.1(3b)SU1 (188.8.131.52900-1) and I have the Cisco 9971 as an available device. I bypassed 7.1(3b) altogether so I don't have a copy in my lab. I can certainly see where some documentation may lead you to believe it is supported with 7.1.3b.
According to the following linke, Cisco recommends updating CUCM to 7.1(3b)SU1 to support 8900 or 9900 phones.
I finally upgraded / took my ucm cluster to version 184.108.40.206900-1, but just in case before i went all the way to 220.127.116.11900-1, i took my cluster to 18.104.22.168000-1, and with 22.214.171.124900-1 version i was finally able to add my new 9971's phones to the cluster, thanks guys for all your help..
IntroductionThe IssueServices Shown their status as UnknownWhat actions require to be taken?Logs required for troubleshootingWhat to expect in the logs:
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