CardDAV Configuration
A CardDAV defines access to a web address book using the CardDAV internet standard.
CardDAV settings
| Setting | What To Do | 
| Name | Enter a name that identifies this configuration. | 
| Description | Enter a description that clarifies the purpose of this configuration. | 
| Hostname and Port | Enter the host name and port for the address book server. | 
| Principal URL | Enter the URL for accessing address book services. | 
| Username | Enter the user name to use for access. | 
| Password | Enter the password to use for access. | 
| Use SSL | Select to use only the secure socket layer for communications between the device and the server. | 
| Per-App VPN | Prerequisite: Configure Tunnel or any per-app VPN configuration before configuring per-app VPN in CardDAV configuration. From the drop-down menu, select the pre-configured per-app VPN configuration. Applicable to: iOS 14+ | 
| iOS 10+ | |
| Communication Service Rules | Choose a default app to use to make audio calls to contacts within the CardDAV system. | 
For more information, see How to create a configuration