I'm writing an application for Windows Mobile 7 which required information about "When a voice call was placed" and "when a voice call was hanged up or disconnected". Are there any API's or events/triggers that can give me this information.
Windows Phone 7 - Events triggered on phone-call-connect and phone-call-disconnect
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While you can't get any information about a specific phone call, if your application is running you can be informed when a call is received (and ended) by using the Obscured and Unobsured events on the page.
Please note that this will be triggered when ANY piece of UI chrome covers the page. In addition to incoming call notifications, this will also include incoming SMS notifications, alarms, etc.
These event are an important part of the application lifecycle for some types of apps (typically games) but are often overlooked.
The current SDK doesn't offer this capability - generally, you cannot keep track of user activity (like calls) outside the application due to a sandboxed environment that by default doesn't offer any system process hooks.