>> Someone told me I cannot mask anything without moving to Kamailio 3.x >> - is that the case? > > That is the case. However, if you do move to 3.x, you should look into the > 'topoh' (topology hiding) module: > > http://www.kamailio.org/docs/modules/3.1.x/modules/topoh.html > Ok, thanks a lot / upgrading time! //Anders