@Mitan, "most of the time" is not really correct. It depends on our decisions. Here I want to support peer 2 peer call when both UA does not in symmetric NAT, to reduce task for the rtpproxy :)
On Mon, Mar 4, 2013 at 5:43 PM, Mitan Lopez <mita...@aol.com> wrote: > So RTP proxy servers are used most of the time in Internet to communicate > between 2 UA's? (in this case why bother to check all those lines in > kamailio cfg?) > > Mitan Lopez > mita...@aol.com > > > -----Original Message----- > From: Alex Balashov <abalas...@evaristesys.com> > To: sr-users <sr-users@lists.sip-router.org> > Sent: Mon, Mar 4, 2013 11:30 am > Subject: Re: [SR-Users] Cannot hear voice with symmetric NAT and STUN > > On 03/04/2013 02:55 AM, Khoa Pham wrote: > > @Alex: thanks for reply > > > > In this IPv4 world, most devices are in NAT, and it only matters if they > > are symmetric NAT or not. > > > > So if 1 client is behind symmetric NAT, I want to use rtpproxy, > > otherwise, I do not. > > According to what I read from kamailio cfg, Kamailio only knows if > > client is NATed or not, it doesnot know the NAT type > > That's correct. > > The only way you can infer whether a client is symmetric is through its > insertion of the 'rport' parameter into the Via header. However, > symmetric clients are not required to insert it; it is only so that a > client can request symmetric behaviour from a server. AS RFC 3581 says: > > A client, compliant to this specification (clients include UACs and > proxies), MAY include an "rport" parameter in the top Via header > field value of requests it generates. > > Certainly, there's nothing saying it must do so. > > However, almost all UAs out there are symmetric these days. It's got to > be over 95%+. Have you run into one that isn't? > > -- Alex > > -- > Alex Balashov - Principal > Evariste Systems LLC > 235 E Ponce de Leon Ave > Suite 106 > Decatur, GA 30030 > United States > Tel: +1-678-954-0670 > Web: http://www.evaristesys.com/, http://www.alexbalashov.com/ > > _______________________________________________ > SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing > listsr-us...@lists.sip-router.orghttp://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users > > > _______________________________________________ > SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list > sr-users@lists.sip-router.org > http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users > > -- Khoa Pham HCMC University of Science Faculty of Information Technology
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