Advanced Business Rules? Subject containing clients tel' no - link to client?

Advanced Business Rules? Subject containing clients tel' no - link to client?

Is it possible to have a business rule that does the following?
 
If subject contains a customers telephone number, then assign it to that client/account?
 
This would involve some form of looklup to reference the clients telephone number against the subject line.
 
If this can't be done, can anyone think of another way without having to manually type in each clients phone number into a business rule.
 
Actually I see that business rules won't allow you to specify client / account as an action, so I suppose I couldn't do this anyway, even if I found a way.
 
Any ideas / help appreciated.
 
Thanks.
 
Keith.

                New to ADSelfService Plus?