Identity
Setting up the identity is mandatory for operating the softphone and is therefore part of the initial setup. The identity contains all configuration data needed to register with a PBX and make phone calls using it.
Security 
Connections can be encrypted to prevent eavesdropping.
The encryption of the connection setup and termination as well as the signaling is carried out by SIPS. The encryption of the call data is carried out by SRTP (Secure Real-Time Transport Protocol).
A certificate must be provided to use SIPS. The certificate must be known to the PBX.
*Important: The encryption is specified by the PBX. The settings in the softphone must be adjusted accordingly.
Support for voice mailboxes of the PBX 
The phone number of a voice mailbox set up in the PBX and assigned to the user/subscriber is part of the identity. Messages and announcements are not stored on the phone, but on the PBX.
Voicemail messages can be loaded and played via:
Voicemails
Alternative way to access the page is via the icon in the status bar:
*Description of the operation and display under Voicemails
Setup 
Set up identity.
Identity
*Details about the settings are in Identity
*Note: Various identity settings are automatically set via provisioning by the PBX and should not be changed.
*Note: Some of the identity settings can only be viewed via the backup file (*.xml) and can only be changed via backup or provisioning: display name, domain, port, DNS and STUN server, DTMF method, country, area code and handling for subscription and registration
*Further help under Backup
*Further help under Provisioning