3.1(4a) and 3.1(4b) support the 7940/60 with load P00303010405, 7935 with load P005C302 and according to the link below the 7910 with load P00403010405.
http://www.cisco.com/univercd/cc/td/doc/product/voice/c_callmg/ccmcomp.htm
The last time I posted this link someone took my comments to mean "look here, don't post that question" Not my intention then or now. Just provoding the link for any and all future references to use as anyone sees fit.
Hope this helps.
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