It doesnt have to specifically "send" 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're using android and most prolly csipsimple, you have an option to verify the exact server certificate or it's certificate authority. And also use a tls password along with a client certificates. You can find the settings in the expert wizard.

On Jun 27, 2013 6:06 PM, "Burak BorYazılım" <mburakbor@gmail.com> wrote:
Hi,

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' 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.

Thank you,
Regards...

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