Hi All, I have the kamailio configed as below on Solaris 10 (Sparc): # ----- nathelper ----- #!ifdef WITH_NAT modparam("nathelper", "rtpproxy_sock", "udp:127.0.0.1:7722") modparam("nathelper", "natping_interval", 30) modparam("nathelper", "ping_nated_only", 1) modparam("nathelper", "sipping_bflag", 7) modparam("nathelper", "sipping_from", "sip:pinger@kamailio.org") modparam("registrar|nathelper", "received_avp", "$avp(i:80)") modparam("usrloc", "nat_bflag", 6) #!endif and rtpproxy is started as AppSer01:ipunity@/opt/ipunity$ ps -ef |grep rtp ipunity 4687 1 0 12:58:20 ? 0:00 /usr/local/bin/rtpproxy -l 210.xx.xx.xx -s udp:localhost:7722 AppSer01:ipunity@/opt/ipunity$ netstat -an |grep 7722 127.0.0.1.7722 Idle 127.0.0.1.41509 127.0.0.1.7722 Connected 127.0.0.1.41510 127.0.0.1.7722 Connected 127.0.0.1.41511 127.0.0.1.7722 Connected 127.0.0.1.41512 127.0.0.1.7722 Connected 127.0.0.1.41513 127.0.0.1.7722 Connected 127.0.0.1.41514 127.0.0.1.7722 Connected 127.0.0.1.41515 127.0.0.1.7722 Connected 127.0.0.1.41516 127.0.0.1.7722 Connected 127.0.0.1.41517 127.0.0.1.7722 Connected 127.0.0.1.41518 127.0.0.1.7722 Connected 127.0.0.1.41519 127.0.0.1.7722 Connected However, kamailio is not able to connect the rtpporxy, Jul 24 12:58:59 AppSer01 /usr/local/kamailio-3.0/sbin/kamailio[22867]: [ID 788202 local0.error] ERROR: nathelper [nathelper.c:2457]: can't send command to a RTP proxy Jul 24 12:58:59 AppSer01 /usr/local/kamailio-3.0/sbin/kamailio[22867]: [ID 844113 local0.error] ERROR: nathelper [nathelper.c:2492]: proxy <udp:127.0.0.1:7722> does not respond, disable it Jul 24 12:58:59 AppSer01 /usr/local/kamailio-3.0/sbin/kamailio[22867]: [ID 582370 local0.error] ERROR: nathelper [nathelper.c:3144]: no available proxies Jul 24 12:58:59 AppSer01 /usr/local/kamailio-3.0/sbin/kamailio[22867]: [ID 788202 local0.error] ERROR: nathelper [nathelper.c:2457]: can't send command to a RTP proxy Jul 24 12:58:59 AppSer01 /usr/local/kamailio-3.0/sbin/kamailio[22867]: [ID 844113 local0.error] ERROR: nathelper [nathelper.c:2492]: proxy <udp:127.0.0.1:7722> does not respond, disable it Jul 24 12:58:59 AppSer01 /usr/local/kamailio-3.0/sbin/kamailio[22867]: [ID 582370 local0.error] ERROR: nathelper [nathelper.c:3144]: no available proxies Jul 24 12:59:04 AppSer01 /usr/local/kamailio-3.0/sbin/kamailio[22870]: [ID 582370 local0.error] ERROR: nathelper [nathelper.c:2627]: no available proxies Jul 24 12:59:04 AppSer01 /usr/local/kamailio-3.0/sbin/kamailio[22870]: [ID 582370 local0.error] ERROR: nathelper [nathelper.c:2627]: no available proxies Any helps are appreciated. Thanks, Kevin _________________________________________________________________ SkyDrive电子画册，带你领略精彩照片，分享“美”时“美”刻! http://www.windowslive.cn/campaigns/e-magazine/ngmchina/?a=c