Hmm, if u mean JRules and not JBPM it is the wrong forum.
I don't know well, but i don't think that JRule or JBPM have a own WebService
(maybe JBPM with BPEL have one).
So i think u must make ur own.
Try to use java 6.0 and the new WS in it (JAX-WS 2).
JRules (ILog) != JBossRules (Drools)
Hmmm.... java 6.0... most big companies are now starting to migrate to 4.0 or maybe 5.0