# FX100 Audio Transmission via USB

**URL:** <https://forum.sierrawireless.com/t/fx100-audio-transmission-via-usb/7098>\
**Category:** Legacy FX/FXT series\
**Created:** [March 21, 2014, 6:51am UTC](https://forum.sierrawireless.com/t/fx100-audio-transmission-via-usb/7098 "2014-03-21T06:51:23Z")\
**Posts on this page:** 1\
**Showing post:** 1

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**Author:** ![kspang](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/kspang/32/1845_2.png) [@kspang](https://forum.sierrawireless.com/u/kspang)\
**Post date:** [March 21, 2014, 6:51am UTC](https://forum.sierrawireless.com/t/fx100-audio-transmission-via-usb/7098/1 "2014-03-21T06:51:23Z")

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Hi,

I have a FX100.  
AT commands could be sent via Putty perfectly.  
GSM Voice call could be established with “ATD” too.

However, I’m unable to find a way to send the voice data (PCM wave) to the modem via USB/Serial.  
Is there any AT command to enable this so that I can send/receive the GSM voice data via USB/Serial?

Thank you.

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