Bogdan-Andrei Iancu wrote: I will use it in the following scenario: Client behind NAT --> openser+mediaproxy ---> GW To fetch reINVITEs, I add the NAT=yes paramter to the record route and look for this paramter in the loose_route section. If the paramter is found, I again use_mediaproxy and set the reply_route. In the reply_route I would: if (!from_gw()) { force_rport; fix_nated_contact; } to prevent rewriten the contact of asymmetric GWs. Would there be a better solution for this? klaus