Can you try use these two SIP accounts (one for each NAT) to see if I can reproduce this behavior? SIP address: test1(a)ag-projects.com Display name: Andrzej test1 Username: test1 Password: test1 Domain/Realm: ag-projects.com SIP Proxy: sip.dns-hosting.info Outbound Proxy: sip.dns-hosting.info SIP address: test2(a)ag-projects.com Display name: Andrzej test2 Username: test2 Password: test2 Domain/Realm: ag-projects.com SIP Proxy: sip.dns-hosting.info Outbound Proxy: sip.dns-hosting.info I may be able to debug SERMediaProxy for the uncaught exceptions. -- AG -------- Hi all ! The 0.8.13-dev-merged-23. It is possible to make call between 2 different clients behind 2 different NATs ? Private UA1-------NAT1------SER------NAT2-------Private UA2 When I try rtpproxy it doesn't work When I try rtproxy from AG Projects i have Jan 19 10:17:47 sipek rtpproxy[25480]: session 3317371653 at 157.158.252.201 (RTP): peer1 signed in from 157.158.252.201:16384 Jan 19 10:17:47 sipek rtpproxy[25480]: error: uncaptured python exception, closing channel <rtphandler.RTPProxy connected 0.0.0.0:35010 at 0x8178a84> (socket.error:(11, 'Resource temporarily unavailable') [/usr/lib/python2.2/asyncore.py|poll3|183] [/usr/lib/python2.2/asyncore.py|handle_read_event|396] [rtphandler.py|handle_read|280] [rtphandler.py|recvfrom|265]) Everything works between clients behind this same NAT or between client behind NAT and public client. Maybe something is blocked on some NAT ? Thanks Andrzej