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Full Duplex Audio

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Created: vvsnaresh (05 Apr 2007)
Last edited: hamishwillee (14 Jun 2013)


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 achieve 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..


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


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

  • MultimediaDD
  • Network Control
    • For setting the WLAN Connection as VOICE.(RSocket)



EPOC Kernel Architecture 2

Discussion On VoIP


This page was last modified on 14 June 2013, at 04:58.
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