The phone dial pad icon at the of the application appears when the CoreNexa desktop client is successfully registered to a SIP phone system, such as CoreNexa’s integrated voice platform. In the left side menu you will find access to Voicemail, Recordings and Call History if you are utilizing CoreNexa for phone system functionality.
Once the call is connected, mute, hold, add a party, transfer, and hangup call controls will appear at the top of the page on the right hand side.

Third party phone systems can be utilized by entering SIP credentials in Preferences → Soft Phone. If this feature is used, there is no integration for third party voicemail, recordings, or call history in the left side menu.