Persistent "Acquiring Service" State:

This message can be seen if the phone is attempting to register using TLS on a system where TLS is not enabled or the certificates were not properly configured for TLS phone support before connecting the phones. The resolution is to disable TLS or upload a suitably configured certificate and then perform a factory reset on the phone.

Changing IP Office Systems:

To switch a phone between different IP Office systems requires a factory reset of the phone. This is due to root certificate name for the TRUSTCERTS settings on each system being the same (WebRootCA.pem). The phones cannot distinguish between different certificates with the same name.

Changing HTTPS Servers:

To switch between different HTTPS servers may require a factory reset . This is needed to ensure clearing any previously installed HTTPS file server root certificate. This is not necessary if both HTTPS servers have identity certificates signed by the same root certificate authority.

Changing from HTTPS server to HTTP server:

To switch the phone from a HTTPS file server to a HTTP file server when TLS is configured on the IP Office, requires a factory reset on the phone. This is needed since IP Office initially configures the phone to use HTTPS when TLS is configured.

Contacts/Recents Display:

The phone only support the user's personal contacts. It does not display system directory contacts.

Support for contacts/recents requires the phone to be installed using HTTPS. If not, contacts using HTTP is possible if HTTP Directory Read and HTTP Directory Write are enabled in the system's security settings. This also affects the display and operation of the phone's Recents menu.