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If you want to use the Speex ACM codec in Netmeeting, you need to register the codec with Netmeeting. Microsoft offers an API to accomplish this task. http://msdn.microsoft.com/library/default.asp?url=/library/en-us/netmeet/nm3 codec_1xk3.asp The function is called AddACMFormat in the IInstallAudioCodecs COM interface. It takes a fully initialized WAVEFORMATEX structure as well as an extra AUDCAP_INFO structure as arguments. This WAVEFORMATEX structure can be obtained by querying the ACM codec for its supported modes. If you are familiar with COM programming under Windows, this is a task that wil...