[Serusers] REGISTRATION high pace & build_contact() error

Hi all, using sipsak in usrloc mode to test the SER sip REGISTRAR with the following process : loop: ./sipsak -U -p host.foo.com -x 3600 -a passwd -s sip:user@foo.com goto loop I get the following mesg in LOG file after 2 mins : build_contact(): No memory left ... and after a while : ERROR: build_res_buf_from_sip_req: out of memory ; needs 28132 send_reply(): Error while sending 200 OK ... CRITICAL ERROR : Can't save Contact to MySQL Location DB (this is a log mesg in my ser.cfg in case : if (!save("location")) ) ERROR: sl_reply_error used: I'm terribly sorry, server error occurred (1/SL) although it seems that SER keeps going (?) to write in Location DB both SER's & MySQL (this seems strange). I have IBM eServer 336 x 2 : - 2 dual core Intel Xeon 3.6 GHz with 2MB Cache, EMT64 - 4 GB RAM - 2x72GB Ultra 320 Scsi disks # ser.cfg children=5 Could this be a memory leak problem in SER ? Is there any conf fine-tuning I can do in order to avoid that ? When I increase the 'children' up to 20, the problem happens again but within 5 mins. thanks for any help, Kostas