I'm unable to make Zoiper register to my PBX without the Certificate error warning dialog popping up.
I've loaded the custom CA in the Android certificate store. The server certificate's CN is a valid FQDN on my network. However, zoiper always complains about the issuer (the CA).
The same certificate is used on a webserver on the same machine. Chrome on android doesn't complain and validates the certificate when accesing https://mypbx.lan
The same setup on iOS (importing the CA to the trust store, etc) and Zoiper works as expected.
What do I need to do to make Zoiper connect without warning to my pbx?