GSM modem documentation

Harald Welte laforge at
Fri Jul 13 18:01:14 CEST 2007

On Thu, Jul 12, 2007 at 07:17:15PM +0300, Petri Aarnio wrote:
> Hi All,
> I noticed on HW wiki that GSM modem documentation is not available. I think 
> this is quite bad situation while the phone functionality is under 
> construction now. Especially I'm missing the AT interface spec.
> It's true that Calypso AT interface spec is based on GSM 07 series specs. 
> But all GSM modems I have worked with have had specific features on top of 
> GSM basic AT functionality,  related to e.g. real time clock,  power 
> management...

there are none of those proprietary vendor-specific commands needed for
the full functionality of the device.

> I already  have noticed that  SMS application developer would have needed  
> Calypso AT interface specification, it would have cleared most of the 
> questions on the topic.

no, that is not true.  Where would you have needed anything besides
07.05, 07.07 and 07.10 for SMS implementation?
Please give me an exact example.  I do not believe so.

- Harald Welte <laforge at>         
Software for the world's first truly open Free Software mobile phone

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