The Server (ser 0.9.3) is behind NAT - together with the one client, both clients can call the other part, Part a (behind nat) - cannot hear what part B says, but part B can hear what part A says.. Part b is connected directly to internet, throug a Sipura 2100.. Someone with a Idea what could be wrong? René (ports open in NAT router are from 5055 - 5075 and 8100 - 65000) those ports point to the SER server _______________________________________________ Serusers mailing list serusers(a)lists.iptel.org http://lists.iptel.org/mailman/listinfo/serusers