Not trustworthy
Proceed as follows:
• Using the Configuration Manager (page Administration > Certificates)
If checking of the server certificate against the root certificate (or stack of certificates) stored in the PBX fails, the connection will be interrupted and the certificate will be regarded as not trustworthy.
Issuer
The column displays the issuer of the certificate.
Issued on
The column displays when the certificate has been issued.
Valid until
The column displays the validity period of the certificate.
 Trust certificate
The marked certificate is considered trustworthy.