Thank you Daniel. We tried with -s udp:10.25.1.1:7722, but received the same result. We see in log file of rtpproxy and in tcpdump in Kamailio, that remote rtpproxy send response to all requests from Kamailio. Best regards, Julia _____ From: sr-users-bounces(a)lists.sip-router.org [mailto:sr-users-bounces@lists.sip-router.org] On Behalf Of Daniel-Constantin Mierla Sent: Tuesday, December 24, 2013 11:33 AM To: Kamailio (SER) - Users Mailing List Subject: Re: [SR-Users] RTPProxy on a different machine than Kamailio problem Hello, from logs, kamailio cannot communicate with rtpproxy. I never used rtpproxy with -s udp:*:7722, so I don't know if it is valid, you should try with -s udp:10.25.1.1:7722 Cheers, Daniel On 24/12/13 09:45, Julia wrote: Hello, I try to run RTPProxy on a different machine than Kamailio (Kamailio IP is 10.25.1.5 without NAT) for rtp recording. Remote machine has an IP Address of 10.25.1.1 and started with /usr/local/bin/rtpproxy -l 10.25.1.1 -s udp:*:7722 -F -P -r/log/rtp_trace In Kamailio configuration file: modparam("rtpproxy", "rtpproxy_sock", "udp:10.25.1.1:7722") And then, we receive an error after Kamailio start: /usr/local/sbin/kamailio[24510]: ERROR: rtpproxy [rtpproxy.c:1527]: timeout waiting reply from a RTP proxy /usr/local/sbin/kamailio[24510]: ERROR: rtpproxy [rtpproxy.c:1536]: proxy <udp:10.25.153.149:7722> <udp:10.25.153.149:7722> does not respond, disable it /usr/local/sbin/kamailio[24510]: WARNING: rtpproxy [rtpproxy.c:1404]: RTP proxy went down during version query /usr/local/sbin/kamailio[24510]: WARNING: rtpproxy [rtpproxy.c:1430]: support for RTP proxy <udp:10.25.153.149:7722> <udp:10.25.153.149:7722> has been disabled temporarily In netstat -a: udp 0 0 KAMnet-JAF-TST-01:53522 vm-kamnet-dev01.bgtehi:7722 ESTABLISHED udp 0 0 KAMnet-JAF-TST-01:36633 vm-kamnet-dev01.bgtehi:7722 ESTABLISHED udp 0 0 KAMnet-JAF-TST-01:32925 vm-kamnet-dev01.bgtehi:7722 ESTABLISHED It works, when Kamailio & RTPproxy are configured in the same machine, with modparam("rtpproxy", "rtpproxy_sock", "udp:localhost:7722"), Is there something wrong in configuration of remote mode? Thanks for any help, Julia _______________________________________________ SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list sr-users(a)lists.sip-router.org http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users -- Daniel-Constantin Mierla - http://www.asipto.com http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda