# Q26Extreme CSD Data Call
**URL:** https://forum.sierrawireless.com/t/q26extreme-csd-data-call/5766
**Category:** Legacy AirPrime modules
**Created:** [July 25, 2012, 5:21pm UTC](https://forum.sierrawireless.com/t/q26extreme-csd-data-call/5766 "2012-07-25T17:21:59Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@maxiclo](https://forum.sierrawireless.com/u/maxiclo)
#### Post date: [July 25, 2012, 5:21pm UTC](https://forum.sierrawireless.com/t/q26extreme-csd-data-call/5766/1 "2012-07-25T17:21:59Z")
Hello,
we are tring to make CSD data call from another modem to the Q26Extreme, but it seem unable to receive this kind of calls. In the AT command reference we found that AT+FCLASS command is not supported since version 7.35. There is a new command that override the fclass?
Regards,
Max
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### Author:  [@awneil](https://forum.sierrawireless.com/u/awneil)
#### Post date: [July 25, 2012, 5:43pm UTC](https://forum.sierrawireless.com/t/q26extreme-csd-data-call/5766/2 "2012-07-25T17:43:58Z")
Some networks require a separate number to be allocated for CSD…
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### Author:  [@awneil](https://forum.sierrawireless.com/u/awneil)
#### Post date: [July 25, 2012, 5:48pm UTC](https://forum.sierrawireless.com/t/q26extreme-csd-data-call/5766/3 "2012-07-25T17:48:32Z")
[https://forum.sierrawireless.com/t/incoming-data-calls-to-uk-orange-sims/1530/1](https://forum.sierrawireless.com/t/incoming-data-calls-to-uk-orange-sims/1530/1)
[https://forum.sierrawireless.com/t/data-on-uk-gsm-networks/1079/1](https://forum.sierrawireless.com/t/data-on-uk-gsm-networks/1079/1)