Hello I got the following setup: Phone1 and FS behind NAT1. Phone2 behind NAT2 Phone1 -> FS -> NAT1 -> INTERNET <- NAT2 <- Phone2 Both phone1 and phone2 registers to FS. Phone1 on the internal profile and Phone2 on a profile that is identical to internal, except that external sip/rtp ips are set. Everything works when Phone2 calls Phone1 (speech in both directions) When Phone1 calls Phone2 I get only speech in one direction (from phone1 to phone2). Anyone got any idea why? //Jonas