Deploying Polycom CX700 Phone within a Microsoft Office Communications Server 2007 R2 Environment
—Cn=Certificate Authorities, cn=Public Key Services, CN=Services, cn=Configuration, dc=<AD Domain>
The LDAP request is BaseDN: CN=Configuration, dc= <Domain> Filter: (objectCategory=pKIEnrollmentService) and searched for attribute is dNSHostname. Be aware that the device downloads the certificate by using HTTP get - 
Trusted Authorities Cache
The following table lists the public certificates that are trusted by the Polycom CX700 phone.
Vendor | Certificate Name | Expiry Date | Key Length | 
  | 
  | 
  | 
  | 
Comodo  | AAA Certificate  | 12/31/2020  | 2048  | 
  | Services  | 
  | 
  | 
  | 
  | 
  | 
  | 
Comodo  | AddTrust External  | 5/30/2020  | 2048  | 
  | CA Root  | 
  | 
  | 
  | 
  | 
  | 
  | 
Cybertrust  | Baltimore  | 5/12/2025  | 2048  | 
  | CyberTrust Root  | 
  | 
  | 
  | 
  | 
  | 
  | 
Cybertrust  | GlobalSign Root  | 1/28/2014  | 2048  | 
  | CA  | 
  | 
  | 
  | 
  | 
  | 
  | 
Cybertrust  | GTE CyberTrust  | 8/13/2018  | 1024  | 
  | Global Root  | 
  | 
  | 
  | 
  | 
  | 
  | 
VeriSign  | Class 2 Public  | 8/1/2018  | 1024  | 
  | Primary  | 
  | 
  | 
  | Certification  | 
  | 
  | 
  | Authority  | 
  | 
  | 
  | 
  | 
  | 
  | 
VeriSign  | Thawte Premium  | 12/31/2020  | 1024  | 
  | Server CA  | 
  | 
  | 
  | 
  | 
  | 
  | 
VeriSign  | Thawte Server CA  | 12/31/2020  | 1024  | 
  | 
  | 
  | 
  | 
VeriSign  | Comodo  | 1/7/2010  | 1000  | 
  | 
  | 
  | 
  | 
VerSign  | Class 3 Public  | 8/1/2028  | 1024  | 
  | Primary  | 
  | 
  | 
  | Certification  | 
  | 
  | 
  | Authority  | 
  | 
  | 
  | 
  | 
  | 
  | 
Entrust  | Entrust.net  | 12/24/2019  | 2048  | 
  | Certification  | 
  | 
  | 
  | Authority (2048)  | 
  | 
  | 
  | 
  | 
  | 
  | 
Entrust  | Entrust.net Secure  | 5/25/2019  | 1024  | 
  | Server Certification  | 
  | 
  | 
  | Authority  | 
  | 
  | 
  | 
  | 
  | 
  | 
9