Making a csd call with sim900 not working

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lucho1045

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Hi people, I am working with two sim900 module but I can make them call each other trought a csd call. Has somebody done this?, Could you give some advice of how is the correct AT Commands sequence?. I really apreciated your help I am stuck on this about two weeks.

Thanks. Best Regards.
 

ATD0000000
Press Enter

without a semicolon will make a circuit swicthced call, and you should use

ATA
Press Enter

from the other module to answer the data call
 

Thanks but I do that and it doesnt work. Do I need a special simcard for CSD calls or a normal simcard with voice should work. Thanks...
 
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    kkny

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CSD = Circuit swithced data call

which opens a data transfer channel between two modems or phones

ATDxxxxx without semicolon initialtes this call and ATA from the other module or modem will answer it

Regards
 
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    alexxx

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