xlite4ab is a free Address Book plug-in which will allow you to quickly make a X-Lite phone call using the contextual menu of a phone number.
xlite4ab strips out local international prefix, if any. The first time the script is invoked the user is prompted for local international prefix, then the script stores it in preferences file (“com.faqintosh.AddressBookScripts”).
Such preferences are shared with other scripts by faqintosh.com, then the prefix could be already set.
Installation: Copy the X-Lite.scpt file to the ~/Library/Address Book Plug-Ins folder (create it if necessary). If Address Book is running then quit it, and run it again.