Hi Nanang, thanks for your answer, I really appreciate the interest of the pjsip team in helping us and I myself try to help others and answer question from the mail list when I can. Anyway, back to your answer, as you can imagine, I dont have control over the others parties NATs or non-NATs specification so Im interested on using TURN but even I had made a little research about it, it not completely clear to me. I need a turn server, but then I also could use ICE to detect if there is no need to use TURN right? I wil appreciate if you can enlighten me a little about how to use TURN and what do I need to be able to use it. Im don't know if I should add this question in a new thread, but thought that maybe it will be interesting for other people with the same problem that will be following this thread. Thanks! Pablo N. > Date: Mon, 11 Oct 2010 08:30:20 +0700 > From: Nanang Izzuddin <nanang@xxxxxxxxx> > To: pjsip list <pjsip at lists.pjsip.org> > Subject: Re: Unable to hear voice in local speaker using Pjsua > app on iPhone iOS4 > Message-ID: > <AANLkTi=12BTL48i_QkXJqwzmtFbr+9CRmfCSHEMD-RHL at mail.gmail.com> > Content-Type: text/plain; charset=ISO-8859-1 > > Hi Pablo, > > The other party should be behind (much) less restrictive NATs, e.g: > full-cone, or non-NAT-ed. Otherwise, as Benny mentioned, you will need > relaying service such as TURN. > > BR, > nanang >