Please note that no matter how each line is configured on the idle screen, all the lines in call screen will keep line or shared
line displayed for the corresponding accounts. For example, even if the user has configured all lines as VPK (with non-LINE
mode), he/she can still use the configured account to dial out by Offhook or pressing SPEAKER, HEADSET or any other
unconfigured LINE key to go to call screen.
Figure 19: Dial Screen
When user is in call screen (during a call), he/she can press softkey to switch back to VPK screen.