Apparently getting access to the microphone stream during calls, even from your own app, is really tough. There is only one provider that we know that implements the concept of "advanced audio filters" and that's Twilio's Voice SDK for iOS.
Interactive presentation tool with live webpages, maps, documents, videos and 3D models right inside the presentation slides. Use your voice and gestures to control the presentation with your mobile phone. Free version is available now at www.voiceboard.info
