<div dir="ltr">thank you and sorry for my late reply. <div><br></div><div>Yes I&#39;m using csipsimple. And I know the settings about verify server checkbox. But the problems starts here. After I checked the server verify, the phone could not register to server, gets a connection timeout. </div>
</div><div class="gmail_extra"><br><br><div class="gmail_quote">2013/6/28 Daniel Ivanov <span dir="ltr">&lt;<a href="mailto:sertys@gmail.com" target="_blank">sertys@gmail.com</a>&gt;</span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<p dir="ltr">It doesnt have to specifically &quot;send&quot; anything. It is always up to the connecting peer to do certificate verification. And if the peer is sending a client cerificate server uses it for authentication and connection key negotiation. Since you&#39;re using android and most prolly csipsimple, you have an option to verify the exact server certificate or it&#39;s certificate authority. And also use a tls password along with a client certificates. You can find the settings in the expert wizard.</p>


<div class="gmail_quote"><div><div class="h5">On Jun 27, 2013 6:06 PM, &quot;Burak BorYazılım&quot; &lt;<a href="mailto:mburakbor@gmail.com" target="_blank">mburakbor@gmail.com</a>&gt; wrote:<br type="attribution"></div>
</div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="h5">
<div dir="ltr">Hi,<div><br></div><div>I want to know that does FS support mutual authentication while using TLS. More clearly, does FS send its certificate to client or not? FS can verify the client but I have problems when the clients&#39; server verification and i thought that FS does not send some necessary files(maybe certificate for example) for mutual authentication. I used android phones for clients.</div>


<div><br></div><div>Thank you,</div><div>Regards...</div></div>
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