It seems to be a mystery excatly what version you have to be on. All Cisco docs say
7.1.3+ but I do not 9971 as an avalible device type.
I am running 7.1(3b)SU1 (7.1.3.31900-1) 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.
HTH
Regards,
Bill
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Guys,
I finally upgraded / took my ucm cluster to version 7.1.3.31900-1, but just in case before i went all the way to 7.1.3.31900-1, i took my cluster to 7.1.3.30000-1, and with 7.1.3.31900-1 version i was finally able to add my new 9971's phones to the cluster, thanks guys for all your help..