hav you set your cdr settings in your a800???.. primary cdr server and its password. do you have the two files (cdr.config and cdrsrv.exe)in one folder??…
cdr server usually doesnt depend on what OS you use so WINXP is just fine..
If you think you ahve done everything right, meaning, in the configuration and your cdr program and still not working email me at firstname.lastname@example.org