Certificates
External connections are encrypted to prevent listening in. The processes used to set up and shut down a connection, and signalling, are all encrypted by SIPS.
Configuration
With the Configuration Manager:
• Identities > Options for experts > SIPS
• Identities > Options for experts > Certificate
• Identities > Options for experts > Check hostname
Or directly on the phone:
• Settings > Identities > Security > SIPS
• Settings > Identities > Security > Certificate
• Settings > Identities > Security > Check hostname
Or using provisioning: