Sagem OT-290 trace phone / GSMTAP integration

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Harald Welte laforge at
Mon May 7 17:55:59 UTC 2012

Hi Tyson,

thanks for your introduction and for your interest in this project.

On Mon, May 07, 2012 at 01:20:31PM +0100, Tyson Key wrote:

> I've just received a copy of the e-mail regarding the OT-290, thanks to
> Andrew Back; and I'm wondering it's possible to discuss the feasibility of
> implementing this functionality with Harald - since it doesn't seem to have
> generated much interest from others, 

> and I'm "fortunate" enough to live in a small British town without
> EDGE coverage (which should make it easier to test GPRS-related
> tracing functionality).

Even in areas with EDGE coverage, the network will always fall back to
GPRS if you use a GPRS-only phone (like the OT-290).  So the fact that
your town only has GPRS doesn't make a difference here.

> Although I'm unfamiliar with how things work in Osmocom, I've previously
> worked on Wireshark dissectors for USB-encapsulated AT commands, and
> various NFC/smartcard-related protocols (PN532, FeliCa and MiFare); and am
> also familiar with Nokia's proprietary ISI baseband protocol, and parts of
> ETSI's GSM/UMTS specifications - so this sort of stuff isn't totally alien
> to me.

Cool, this sounds like a good set of skills to address this problem.

> I'm also currently studying Computer Science as an undergraduate (at the
> University of Bradford) - but I should be able to make time to work on this.

I guess time is the key aspect here.  I would definitely want to make
sure that whoever gets a OT-290 for implementing the GSMTAP interfacing
code is likely to be able to complete the task before GPRS is phased out ;)

So I guess I will leave it up to Denis and you to figure out who might
have more of an interest and/or time in this.

- Harald Welte <laforge at> 
"Privacy in residential applications is a desirable marketing option."
                                                  (ETSI EN 300 175-7 Ch. A6)

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