What do you mean 'call a wicket page'? Do you mean load a wicket page to the user after he performs some action on the servlet-loaded page?
What exactly is your use case for this?
I think it would be better NOT to mix jsp and wicket, but given that you did:
BookmarkablePages provide a way to directly address a wicket page as it has a bookmarkable url (for instance, /home instead of /page?13). We use those to load a certain page with certain request parameters (ie, /student/1234/results shows the resultpage for student 1234).
Also, you could implement some kind of listener service that, based upon a certain call/payload, constructs a wicket page and returns the url for that page but that seems a bit overkill. In most cases I think bookmarkable pages a should suffice.
Have a look at http://wicket.apache.org/apidocs/1.5/org/apache/wicket/protocol/http/WebApplication.html#mountPage(java.lang.String, java.lang.Class)
or
http://wicketinaction.com/2011/07/wicket-1-5-mounting-pages/