Hi ????? ?????, thanks for the response 1. If only one side has symmetric NAT, we should use TURN, too. Otherwise, we'll get one way audio 2. In my case, I use Kamailio as SIP proxy. Does Kamailio interfere with ICE behavior ? Because I see that Kamailio detect NAT when client REGISTER, if it see client is NATed, it will force client to use rtpproxy 3. What you mean by TCP, when calling, I thought voice is transmitted through UDP ? On Thu, Mar 14, 2013 at 10:17 PM, ????? ????? <safinaskar at mail.ru> wrote: > Hi Khoa Pham. > Hi all who wants to know what ICE is. > This is beautiful awesome video which completely clearly understandable > says WTF is this ICE (this video is related not only to VoIP): > >>> http://www.youtube.com/watch?v=9MWYw0fltr0 <<< > > >AFAIK, ICE is used to detect as many ways as possible to send media > stream to the other client. If it can't find, it will use TURN protocol to > determine media relay proxy. > Yes > > >How can ICE detect many ways? > ICE is based on two protocols: STUN and TURN. > STUN is designed to determine is there NAT and what type this NAT has. > TURN is designed to transfer data when other ways fails. > In short: > At first (i. e. at beginning of ICE session), both sides connect to STUN > server and determine is there NAT. And what type this NAT has. > If they figure that there is way to connect directly (for example, both > has no NAT or one has NAT and other has no NAT), they will connect directly. > If they figure they cannot connect directly (for example, both sides has > symmetric NAT), they use TURN. > > "Many ways" means: > 1. A connects to B via TCP > 2. B to A > 3. They use ICE > 4. (maybe some other ways) > > > Can we benefit from ICE if we're in symmetric NAT? > Yes. But in this case you need TURN server. > > Askar Safin > _______________________________________________ > Visit our blog: http://blog.pjsip.org > > pjsip mailing list > pjsip at lists.pjsip.org > http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org > -- Khoa Pham HCMC University of Science Faculty of Information Technology -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20130315/ade940c3/attachment-0001.html>
