Psion Teklogix 7527S User's Guide download pdf (Page 234)

Chapter 22: Wireless Wide-Area Networking

Voice Call States

222 Psion Teklogix Mobile Devices SDK Developers Guide

22.12.5 Voice Call States

These voice call states describe the state of a voice connection between the Psion Teklogix com-

puter and the WWAN network. Contact your WWAN network provider to determine which of

these services they support.

The status can change at any time for reasons that are outside the control of the application.

Instead of polling this method, it is recommended that an application creates an event handler.

A typical outbound voice call passes through several of these states, for example:

1. Dialing

2. Alerting

3. Active

4. NormalTermination

An application may not detect all the states that the call passes through.

When the voice call is terminated, the last Voicecall event received has its voice call flag set to last

event. Once this event is received, free the VoiceCall object that you created immediately after in-

voking DialNumber. See “Making A Phone Call” on page 220

A typical inbound call passes through several states, for example:

1. Incoming

2. Active

3. Normal Termination

The event and the flags have different names in C++ and C#.

Voice call on Psion Teklogix 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.

Active

Applies to: incoming and outgoing calls

The Psion Teklogix 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 Psion Teklogix computer has temporarily interrupted 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.

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Psion Teklogix 7527S User's Guide Page 234