SIP TLS peers certificate not verified


I’m trying to get sip tls working on our 2 pbx. It seems that Asterisk do not verify the client certificate (generated from the self signed CA), the client can register as soon as tls protocol is used even if no certificate/key is provided. I’m using blink softphone (following this tutorial: … g+Tutorial). Does someone have any idea of what is going wrong ?

Asterisk version: 11.6.0

Thanks for your help,