Hi, I successfully compiled mod_opal using the latest svn for both opal and ptlib as Brian suggested. When I try to establish a call using h323 from my openphone client I get no audio although I can see RTP packets in both directions when I am doing a capture. Some details : I am using the 11094 revision of the FS trunk. I am using the PCMU codec. I tried dialing the default IVR (5000) and other testing extensions (freeswitch conference, echo test etc.) I tried using fast start on and off , h245 tunneling on and off, h245 in SETUP on and off. In my captures I have also noticed a strange behavior : FS sends to my client 2 "alerting" packets for no apparent reason. Could this be a cause of the problem? Had anyone any success with mod_opal lately? If yes, could you please reply quoting your config options (both on FS and on your client)? -- ------------------------------------------- Apostolos Pantsiopoulos Kinetix Tele.com R & D email: regs@kinetix.gr -------------------------------------------