Asterisk SIP and PJSIP Settings problem

In the SIP setting [chan_pjsip] under the TLS/SSL/SRTP Settings when the "Verify Client" and "Verify Server" are set to yes, the softphone always register without any problem (without the certificates). It's seems to have the same result if we set the two verify to "no", I check in the configuration file pjsip.transports.conf and there are the keys "verify_client=yes" and "verify_server=yes"

I'm using zoiper like a softphone and without upload the server certificate on zoiper and the client certificate on the freepbx it can connect,register and make calls without error/problem.

I would to use a 2 way authentication to be sure that the connected phone is managed by us and have the right certificate released by us

I don't know if I'm doing something wrong in the configuration

Thanks in advance