RE: [Serusers] nat, symmetric /asymmetric UA....clarification needed

There could be clients that can use STUN to get their IP/port and NAT router that can try to fix SIP packets. In my opinion both ways are still not good for cutomers because of many mistakes. Please make sure that you remove all kinf of STUN, ip autodetect from Xlite. In REGISTER that u receiving from UA you should see private IP in Contact if UA behind the NAT, but in location table SER should save right IP (public) and right port (could be same or could be different depending on NAT type) In INVITE same private contact and in SDP media address private. IF NOT - SOMETHING TRIYNG TO FIX NAT TRAVERSAL instead of media/rtp proxy.. which is in most cases bad and need to be fixed Make sure that if you have more then one sip UA behind the same nat you configure different signaling and media source ports (it may be only true for symmetric NAT but it always good to do :) 1. - yes 2. do not know what do you mean. Don't you mix symmetric media and symmetric NAT ? first is good thing when device use same port for sending/receiving media and second is BAD, means that .. I am not sure btw.. that NAT will use same source port for your packets regardless.. please correct me 3. Xlite does symmetric signaling/media 4. what file ? :) I think it something mediaproxy related.. I use rtpproxy -----Original Message----- From: serusers-bounces(a)iptel.org [mailto:serusers-bounces@lists.iptel.org] On Behalf Of Iqbal Sent: Friday, February 25, 2005 11:30 PM To: serusers(a)lists.iptel.org Subject: [Serusers] nat, symmetric /asymmetric UA....clarification needed Hi Just trying to debug why some calls work and other dont, I have 2 setups, in both the UA is xlite , and is natted in both cases...however the routers differ in each case. Now I am running mediaproxy, when I debug ser, in one setups the contact header which is displayed using xlog, shows the external IP address of the router, in the other it does not, this happens after I have passed the fix_contact setting in ser.cfg. The one where it is fixed , allows me to listen to voicemail prompt from asterisk without any problems, the other...no sound. The clarification I need is this.. 1. Mediaproxy solves symmetric NAT problems with ease..Y/N ? 2. For asymmetric stuff you need to add the clients to sip/rtp-asymmetric files Y/N ? 3 If Yes the the client in this case is xlite...which is not really the asymmetric part, its the router in the middle is it not ? 4. If I place slite in the file, will it not then affect the symmetric xlite also. Now if all this fails, can I on the xlite...which seems to be behind the asymmetric setup, use STUN server, if yes, then the mediaproxy I guess will not get called, or should it.....or is it better to map the port/pathsin the router itself. As a last question, if I wanted to determine what type of NATting a device did, or I needed to debug a customers setup, whats the easiest way tks Iqbal _______________________________________________ Serusers mailing list serusers(a)lists.iptel.org http://lists.iptel.org/mailman/listinfo/serusers