Thanks G I'll verify all that, as a matter of fact I am internal network(s) not public but beside a FW. In MediaProxy install, it is said "must" IP public. Do I need a distinctive public IP ? Kind regards, Gtel The config will not mark non-nated devices for proxying ('serctl ul show' will not show the flag set). I suggest you verifiy that none of the EUCs are behind NAT, it should then work regardless of mediaproxy, then ensure that mediaproxy is running properly and that sessions are created (see /var/log/messages). Finally, many people fall in the trap of an iptables firewall or firewall in front of ser. g-) ---- Original Message ---- From: GT To: serusers(a)lists.iptel.org Cc: greger(a)teigre.com Sent: Monday, September 12, 2005 06:11 AM Subject: SER + Mediaproxy sl_send_reply: I won't send a reply for ACK!!