<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><br><div><div>20 sep 2013 kl. 15:16 skrev Kristian Kielhofner <<a href="mailto:kris@kriskinc.com">kris@kriskinc.com</a>>:</div><br class="Apple-interchange-newline"><blockquote type="cite">I've been spending some time looking at some of the significant<br>changes Apple has made to Facetime in iOS 7. I'm far from an Apple<br>fanboy but some of them are pretty interesting:<br><br>- multiplexing everything over a single UDP port<br></blockquote><br></div><div>After reading your very good blog entry (thanks!) I suspect that</div><div>they have gone the extra way and mixed SIP/RTP/RTCP due to</div><div>carrier grade nats. There's a new RFC describing issues with those</div><div>and one is a shortage of ports. Every customer gets only a few </div><div>allocations and only one per common port. ONly one SIP phone</div><div>on 5060 as an example.</div><div><br></div><div>Limiting the number of ports used will not only make firewall</div><div>traversal easier, it will make CGN traversal easier. While waiting</div><div>for the real stuff - IPv6.</div><div><br></div><div>Blog:</div><div><a href="http://blog.krisk.org/2013/09/apples-new-facetime-sip-perspective.html" style="font-family: monospace; ">http://blog.krisk.org/2013/09/apples-new-facetime-sip-perspective.html</a> </div><div>CGN RFC:</div><div><a href="http://www.rfc-editor.org/rfc/rfc7021.txt">http://www.rfc-editor.org/rfc/rfc7021.txt</a></div><div><br></div><div>/O</div><br></body></html>