DRAFT
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extension can be assigned to multiple Line Keys on a SPA941. In fact, all four call appearances
can be instances of the same extension. (This extension is not a Shared Line Appearance
unless it is also assigned to a Line Key on another station.) Any of the four Line Keys can be
disabled. Each call appearance supports one call at a time, either active or on hold.
• VoIP Interface (VI): An Extension and its associated control parameters configured on a particular
station. The SPA941 includes a rich set of configuration parameters to control the operation
when calling via the account. Configuring an extension on the SPA941 includes configuring the
core account information and the set of VI control parameters. While the account information is
usually the same for a shared extension on different stations, the rest of the VI parameters can be
different. For example, the dial plan or the preferred codec to use when making a call on this
extension could be different for two different stations sharing the extension.
• Call Appearance State (CAST): The state of a call appearance which can be one of the following:
o Disabled: The Line Key is disabled
o Idle (Ready): The Call Appearance is ready for use
o Dialing: Collecting digits from the user to be dialed out from this Line
o Calling: Waiting for the called party to respond
o Proceeding (a.k.a. Progressing): Called party’s station is ringing
o Ringing (a.k.a. Alerting): Incoming call, station is ringing
o Connected: Connected with remote party
o Held: Remote party is on hold
o Invalid: Remote party hangs up or error while attempting outbound call
o Busy: the line is being used by another station (shared line only)
• Call State: A Call Appearance State followed by the term “Call”. For example, a Ringing Call, a
Dialing Call
• Active (Call) State: If the state is Dialing, Calling, Proceeding, Connected, or Invalid. When the
state of the Call is Active, it is referred to as an Active Call
• Standby (Call) State: the state is Ringing or Holding. When the state of the Call is Standby, it is
referred to as a Standby Call
• Key: Any one of the keys on the SPA941 keypad. A Key has two states: down (when pressed),
and up (when released)
• Button – a Key with an on and off state. The on/off state toggles when the key is pressed down
where applicable. There are 3 buttons on the SPA941: SPEAKER, HEADSET, and MUTE. Each
button has an associated LED that indicates the on/off state.
• SK(label) – Soft key with the given label, such as SK(select), SK(cancel), SK(dial), SK(conf),
SK(xfer)
• Call Features
Selecting Audio I/O Device and Line
There are three sets of audio I/O devices available: a) Handset, b) Built-in microphone and speaker, and
c) External microphone and headset. The speaker is also used for ringing. For convenience, where the
context is clear, these are referred to as (b) the speaker, and (c) the headset.
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