I don't think it's a work around but rather a way of handling RFC 3261 via strict adhesion or lessened for non-compliant UAs, etc as described in http://kamailio.org/docs/modules/stable/modules/usrloc.html#contact-matching...
--- Reply to this email directly or view it on GitHub: https://github.com/kamailio/kamailio/issues/280#issuecomment-128695228