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Contents 1 Full Duplex Audio 2 APIs Used 3 APS 4 Capabilities 5 Links

Full Duplex Audio

Full Duplex is data transfer in both directions.

Full Duplex Audio is something which can record as well as play simultaneously. Basically, here, a FullDuplex Audio application should be able to use the device both for recording as well as playing the data, which obviously means that we need support from audio hardware.So, your application should deal with the APIs provided to the sound device to acheive the full duplex audio functionality which is heart of any VoIP application.

And again while talking about VoIP, we have to think about Real Time Kernel,which Symbian OS provides.

APIs Used

Some of the APIs that can be used to acheive this are CMMFDevSound, which is an interface to the raw audio functions on the device hardware and MDevSoundObserver, which is an interface to a set of DevSound callback functions..

APS

And one of the important and related topic in this regard is Audio Proxy Server.

Capabilities

For a standalone VoIP application for S60 3rd edition devices, the application needs two important capabilities which needs manufacturer approval

• MultimediaDD
  • This is for Audio Proxy Server
• Network Control
  • For setting the WLAN Connection as VOICE.(RSocket)

Links

Example

EPOC Kernel Architecture 2

Discussion On VoIP

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