# Can we read GSM payload data with OpenAT OS APIs?

**URL:** <https://forum.sierrawireless.com/t/can-we-read-gsm-payload-data-with-openat-os-apis/4824>\
**Category:** Open AT\
**Created:** [January 12, 2011, 2:18pm UTC](https://forum.sierrawireless.com/t/can-we-read-gsm-payload-data-with-openat-os-apis/4824 "2011-01-12T14:18:48Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![mosama](https://avatars.discourse-cdn.com/v4/letter/m/278dde/32.png) [@mosama](https://forum.sierrawireless.com/u/mosama)\
**Post date:** [January 12, 2011, 2:18pm UTC](https://forum.sierrawireless.com/t/can-we-read-gsm-payload-data-with-openat-os-apis/4824/1 "2011-01-12T14:18:48Z")

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Dear All,

As I understand, in any voice call, the voice is digitized, interleaved, encrypted, … then pass to Channel encoder and to the RF stage. If I need to use my own channel encoder can read read this data via OpenAT APIs and send it to another channel encoder via UART for example?

Which API shall I use?

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**Author:** ![mosama](https://avatars.discourse-cdn.com/v4/letter/m/278dde/32.png) [@mosama](https://forum.sierrawireless.com/u/mosama)\
**Post date:** [January 14, 2011, 8:19pm UTC](https://forum.sierrawireless.com/t/can-we-read-gsm-payload-data-with-openat-os-apis/4824/2 "2011-01-14T20:19:47Z")

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I know that’s crazy 😃

should I give up? or should I ask sierra?  
The problem is that we don’t have local distributors in our country. ☹

Any suggestions?