TLS Handshake failure

Hello,
I’m working on TLS and SRTP on asterisk. I create self-signed certificates for my server .

I managed to connect two clients with Zoiper without problem in server’s logs. But when I tried with a my mobile phone I can observ this warning which don’t allow a good TLS session :

  > Saved useragent "CSipSimple_m0-16/r2330" for peer tete

SSL certificate ok
== Problem setting up ssl connection: error:14094410:SSL routines:SSL3_READ_BYTES:sslv3 alert handshake failure
[May 26 14:30:27] WARNING[15187]: tcptls.c:274 handle_tcptls_connection: FILE * open failed!
(PS : “tete” is the name of user account and “CSipSimple” is my softphone)

I don’t know what is the problem because the others clients can communicate without problem with TLS and SRTP.

Any suggestions would be appreciated.

Regards,
Florian Mabriez

no one have an idea ??