Hi Riza, While it would be nice if PJSIP could make IPv6 connections easier by implementing tickets 419 and 422, I don't really think that's the big issue with iOS at the moment. The big problem is that according to Apple (https://developer.apple.com/news/?id=08282015a), any app that connects to the internet using an IPv4 socket will soon be rejected by the app store. Apple isn't really requiring IPv6 compatibility, they're requiring your app be IPv6 *only*. If you want your app to interact over IPv4, you have to use IPv4-mapped IPv6 addresses with IPv6 sockets. I don't know if PJSIP is currently set up to do this. Regards, John Ridges On 1/29/2016 10:00 AM, pjsip-request at lists.pjsip.org wrote: > Date: Fri, 29 Jan 2016 11:49:01 +0700 > From: Riza Sulistyo <riza@xxxxxxxxx> > To: pjsip list <pjsip at lists.pjsip.org> > Subject: Re: Crash on iOS with NAT64 network > Message-ID: > <CAJg9p02jmNTdMkdgDQ5+tQmzWtmi9hdFLj6Hpx3n1vy1ta2QEA at mail.gmail.com> > Content-Type: text/plain; charset="utf-8" > > Hi Nick, > > We have open ticket for ipv6 in (#419 > <https://trac.pjsip.org/repos/ticket/419>) and (#422 > <https://trac.pjsip.org/repos/ticket/422>). > We are thinking about bumping the priority of one of the ticket to 2.6, > however it's not decided yet at the moment. > > Best Regards, > > Riza >