Hi Andri,
I don't think you will find any support docs (or TAC support) for this Unity version, but
if it's running with CCM 4.2 then it "may" work with CUCM 4.3
Here is the latest Unity Compatibility Matrix which only goes as far back as 4.0(1)
Supported Version Combinations for Cisco Unity, the Cisco Unity-CM TSP, and Cisco Unified Communications Manager
From this compatability Matrix;
http://www.cisco.com/en/US/docs/voice_ip_comm/unity/compatibility/matrix/cutspmtx.html#wp51076
Here is the only 2.4(6) Matrix I can find. it only goes up to CCM 3.2
Compatibility Matrix: Cisco Unity, the AV-Cisco TSP, and Cisco CallManager
http://www.cisco.com/en/US/docs/voice_ip_comm/unity/2x/requirements/246SysRq.html#wp1023205
End-of-Sale and End-of-Life Announcement for the Cisco Unity 2.46
Last Date of Support:March 16, 2004
The last date to receive service and support for the product. After this date, all support services for the product are unavailable, and the product becomes obsolete.
http://www.cisco.com/en/US/prod/collateral/voicesw/ps6789/ps5745/ps2237/prod_end-of-life_notice0900aecd8063c7f2.html
Cheers!
Rob
Please support CSC Helps Haiti
https://supportforums.cisco.com/docs/DOC-8895
https://supportforums.cisco.com/docs/DOC-8727