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Hi
There is a problem with most online voice messengers. When caller is apeaking he hears his voice with some delay, there is the echo. The echo sound is very clear and loud. The programs are Viber, Telegram. Other messengers wich can work smartly with echo cancellation algorithms are trying to kill this echo but sometimes it is also present. For example Whatsapp, Skype. It seems that there is a problem with program mixer which routes sound from speaker to mic path for these programs. Please note that there is no any acoustic feedback. The mic cannot hear speaker, checked also with headset.
It is first time I encountered with such problem, my previous phone Umi Max has no this issue. Now all my callers are complining that they cannot speak with me due to echo. Please note that GSM is working perfectly. There is no any echo effect during an ordinary call.
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