
Chapter 19: Wireless Wide-Area Networking
Voice Call States
Psion Mobile Devices Developers Guide
220
Voice calls on Psion computers use the GSM standard. This standard allows a subscriber to have the
following calls, at the same time:
•One active call
• One held call
• One waiting call
Either the active call or the held call can be a multiparty call with up to five participants.
Active
Applies to: incoming and outgoing calls
The computer is connected to another party over the WWAN network: end-to-end conversation is possible.
Held
Applies to: incoming and outgoing calls
Only available if the WWAN provider supports this feature.
The computer has temporarily suspended the voice call. End-to-end conversation is not possible. The
conversation can be reestablished later.
Dialing
Applies to: outgoing calls
The WWAN network is in the process of contacting the called party.
Alerting
Applies to: outgoing calls
The called party is being notified that there is an incoming voice call. Typically this means that the called
phone is ringing.
Incoming
Applies to: incoming calls
This state applies to an incoming voice call when there is no active voice call. See Section 19.13.13 Audio for
Voice Over WWAN on page 225 for instructions on creating a ring tone.
Waiting
Applies to: incoming calls
Only available if the WWAN provider supports this feature.
This state applies to an incoming call when there is an active voice call, or a previous call in the
incoming state.
No Answer
Applies to: outgoing calls
The called party did not answer the call within a specified, network defined, time.
This state is not often returned as many calls are automatically answered by switchboards and
answering systems.
No Carrier
Applies to: outgoing calls
The computer could not connect to the WWAN network.
Busy
Applies to: outgoing calls
The called party is busy and does not answer the call.
This state is not often returned as many calls are automatically answered by switchboards and
answering systems.
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