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USB modem and voice support

Question asked by Ari Savolainen on Oct 13, 2016
Latest reply on Oct 13, 2016 by igorpadykov

We are using Huawei K3520 USB dongle for phone call in Linux environment. Phone call connection is established with AT commands and voice stream starts to flow from /dev/ttyUSB1.
Problem is that voice stream produces only random noise from speaker although we have tried many different codecs in aplay and Audacity.
Which codecs are commonly used for voice streams in modems and how them are activated with AT commands?

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