Administrator‘s Guide for Yealink VC110 Video Conferencing Endpoint220Yealink IP phones trust the following CAs by default: DigiCert High Assurance EV Root CA Deutsche Telekom AG Root CA-2 Equifax Secure Certificate Authority Equifax Secure eBusiness CA-1 Equifax Secure Global eBusiness CA-1 GeoTrust Global CA GeoTrust Global CA2 GeoTrust Primary CA GeoTrust Primary CA G2 ECC GeoTrust Universal CA GeoTrust Universal CA2 Thawte Personal Freemail CA Thawte Premium Server CA Thawte Primary Root CA - G1 (EV) Thawte Primary Root CA - G2 (ECC) Thawte Primary Root CA - G3 (SHA256) Thawte Server CA VeriSign Class 1 Public Primary Certification Authority VeriSign Class 1 Public Primary Certification Authority - G2 VeriSign Class 1 Public Primary Certification Authority - G3 VeriSign Class 2 Public Primary Certification Authority - G2 VeriSign Class 2 Public Primary Certification Authority - G3 VeriSign Class 3 Public Primary Certification Authority VeriSign Class 3 Public Primary Certification Authority - G2 VeriSign Class 3 Public Primary Certification Authority - G3 VeriSign Class 3 Public Primary Certification Authority - G4 VeriSign Class 3 Public Primary Certification Authority - G5 VeriSign Class 4 Public Primary Certification Authority - G2 VeriSign Class 4 Public Primary Certification Authority - G3 VeriSign Universal Root Certification AuthorityNote Yealink endeavors to maintain a built-in list of most common used CA Certificates. Due tomemory constraints, we cannot ensure a complete set of certificates. If you are using acertificate from a commercial Certificate Authority not in the list above, you can send arequest to your local distributor. At this point, you can upload your particular CAcertificate into your phone. For more information on uploading custom CA certificate,refer to Transport Layer Security on page 178.