Oh, and: you'll definitely want to force_rport() on any initial INVITEs or REGISTERs you've determined to originate from a NAT'd endpoint. -- Alex Balashov - Principal Evariste Systems LLC 260 Peachtree Street NW Suite 2200 Atlanta, GA 30303 Tel: +1-678-954-0670 Fax: +1-404-961-1892 Web: http://www.evaristesys.com/