Tele

Ft defines a call handling protocol similar to the one that has evolved with voice telephony since the late 19th Century. It is based on a canonical flow of the states below which will be the color of the primary button. There are manifold exceptions which the network and subscriber cooperatively manage:

1.   DOWN/OFFHOOK/REJECT 

   All subscribers are initially are in this state and may move to it by personal selection or involuntarily due to network events.

2.    AFK/BUSY

   A subscriber controlled state which blocks calls until the subscriber sets READY.

3.   ACCEPT/ANSWER/READY 

   A subscriber moves to this state after connecting assuming no event, such as their or the network having set a different state once at least one incoming message/call is active.

4.   BUFF/WAIT 

   A network controlled state which indicates incoming events for the subscriber. It is normal for some such events not to result in actual incoming as for example when the remote subscriber cancels a message before sending it.

5.   CALL/LOOKUP/PAGE  

   A state in which the subscriber can or has initiated a call, or can lookup a remote subscriber or group.

Visual cues, such as blinking, fade-in/out indicated attention/opportunity or operation in progress.

The overall Ft GUI operates with elements such as the taskbar, main screen, and conferees array with elements in modal focus to constrain which subscriber pairs are involved and which gestures the subscriber has available. For example single click on a call state prompts for a subscriber lookup, whereas double click when paired with a selected subscriber initiates a call/page.

A distinguished subscriber in a conference call at any one time is the moderator, with overall control.