header when SER has a public address and the UA has a private (i.e. behind NAT). This means that it will rewrite Contact to contain the source ip address:port found in the UDP/TCP header. This is probably correct, because I assume the UA cannot be reached from the outside anyway. If you record-route, subsequent requests should go through your ser. If you have problems with responses not being returned, have a look at Via headers as they control how answers to i.e an INVITE are routed back to the UA. You may want to have a look at the rr module double record route parameter to make sure that SER creates one record-route for the internal and one for the external interface. g-) Sebastian Gabris wrote: After reading a bit more mails, I came to two possible problems: 1. fix_nated_contact() needs a registrar to work properly I dont use a registrar, since i register at the VoIP - Provider. or 2. fix_nated_contact() is not ment to be used on this scenario Any ideas on this? Sebastian Hi everybody, need some help on nattraversal. i use a multihomed SER, one private IP & one public IP. MyUA(privateIP) <-> (privateIP)SER(publicIP) <-> UA-(VoIP - Provider, pubicIP) If i try to make a call from private net to public net, SER doesnt change the contact address. He changes the sdp - connection field but he, puts in the wrong IP - address. Instead o writing down his public IP, SER writes his private IP. Then SER forwards the call on his public interface to the provider, which will get wrong Contact & SDP information. After reviewing my logs i saw that SER does the nat_uac_test, but the fix_nat_contact & fix_sdp dont work dont do what they should do :) Here are the important bits of my config: fork=yes log_stderror=no mhomed=1 listen=10.x.x.x listen=193.x.x.x loadmodule "/usr/lib/ser/modules/nathelper.so" modparam("usrloc", "db_mode", 0) modparam("registrar", "nat_flag", 6) modparam("nathelper", "natping_interval", 30) # Ping interval 30 s modparam("nathelper", "ping_nated_only", 1) # Ping only clients behind NAT if (nat_uac_test("3")) { if (method == "REGISTER" || ! search("^Record-Route:")) { log(2,"LOG: Someone trying to register from private IP, rewriting\n"); fix_nated_contact(); # Rewrite contact with source IP of signalling if (method == "INVITE") { fix_nated_sdp("1"); # Add direction=active to SDP }; force_rport(); # Add rport parameter to topmost Via setflag(6); # Mark as NATed }; }; ... and so on. ______________________________________________________________ Verschicken Sie romantische, coole und witzige Bilder per SMS! Jetzt bei WEB.DE FreeMail: http://f.web.de/?mc=021193 _______________________________________________ Serusers mailing list Serusers(a)lists.iptel.org http://lists.iptel.org/mailman/listinfo/serusers _____________________________________________________________________ Der WEB.DE SmartSurfer hilft bis zu 70% Ihrer Onlinekosten zu sparen! http://smartsurfer.web.de/?mc=100071&distributionid=000000000071 _______________________________________________ Serusers mailing list Serusers(a)lists.iptel.org http://lists.iptel.org/mailman/listinfo/serusers