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How can I do a voice echo back test on a GSM mobile phone?

echo GSM Mobile Phone Test Voice
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How can I do a voice echo back test on a GSM mobile phone?

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On the screen for setting parameter, open the window of TCH Test Pattern in common pattern. And Set “Echo”. In case of the test by using handset, TCH Test pattern should be set to “Voice Codec” after the parameter of Codec has been set to [EFS].

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