Hi, I am thinking about the way to have b2bua with full rtp proxy functionalities. The one wayout is to incorporate Freeswitch into the sip call flow. My scenario is as follows: Operator_1 ---> OpenSIPS ----> Operator_2 Of course Opensips has B2b functionality but it may be pretty tricky to have this done. The question is could I place FS just after Opensips box like following: Operator_1 ---> OpenSIPS ----> Freewsitch ----> Operator_2 to achieve fully topology hiding (so no SIP/SDP information of Operator_2 should pass to Operator_1 and vice versa). Could I achieve this by using FS? Is the configuration pretty straightforward? What more less will be cps for Quad-core E5620 with 8GB of RAM for aforementioned scenario (here i guess Opensips could be unbeatable). Is 64bit installation a stable one? Thanks in advance, Maciej.