Pavel, I think you have to check if your VoIP gateways can send UDPTL "no-signal" messages. Sometimes the caller gateway doesn't send any messages until it receives CED from callee. Because of that neither MediaProxy nor RTPProxy can't complete the ip/port binding for the media session. Also, check which ports are used for UDPTL session. If they are differ from the ports that were used during the previous voice (RTP) session than you probably have to re-establish mediaproxy session. At least it is true for RTP Proxy that I use. For example, I call unforce_rtp_proxy() and then force_rtp_proxy() on each re-INVITE. To be honest, I have never tried the MediaProxy but I suppose that it works in the similar way like the RTP Proxy. Best regards, Leonid Fainshtein Product Manager IP Gear Ltd., a division of Qualmax "Get your VoIP network "In Gear" with Claro gateways from IP Gear" e-mail: LFAIN(a)ipgear.net Tel: +972-4-9907-525 Fax: +972-4-9990-334 www.ipgear.net