[cisco-voip] regsvc.exe / sqlservr.exe eating up Memory, Callmanager 4.1(3)sr3c, Win 2000.2.7

[cisco at ip-project.com]

Hi all,
our single Callmanager is eating up memory (Callmanager 4.1(3)sr3c, Win 2000.2.7).
After a reboot it uses ~750 MB, and then the 
regsvc.exe and sqlservr.exe are going higher and higher.
Server is a HP DL-380 G4 with 3,2 GHz and 3000 GB Memory.
After 3 - 4 days the 5 GB memory are full (3GB physical+2GB Swap).
I've searched CCO and TAC, but was not successful.
Server has about 90 phones (7940,7960) connected, and the connections to the different locations are resetted every night (so called 'forced segregation' in Germany after 24h, SRST in every location).

I've checked Event Viewer, the only thing that happens every full hour is, and I'm not the SQL-Server expert.
SQL Server Scheduled Job 'Monitor Disk Space' (0x1C726288C664B746B330B90DC1FF4A6F) - Status: Failed - Invoked on: 2006-08-21 18:00:00 - Message: The job failed.  The Job was invoked by Schedule 19 (Schedule 1).  The last step to run was step 2 (TruncateCCMLog). 

What else can I check? What is the regsvc-service for?

TIA,
Hans-Peter