Sagem OT-290 trace phone / GSMTAP integration

Harald Welte laforge at
Mon Apr 9 13:16:37 UTC 2012

Hi all!

Thanks to a generous donor, we have received a couple of OT-290 trace
phones.  These are commercial products intended for taking L2/L3 air
interface traces.  If you've read any of the fabulous GSM papers by
Prof. Dr.-Ing. Joachim Goeller:  The OT-phones is what he used to
generate all his traces.

The majority of what those phones can do is now also possible with

However, OT-290 support GPRS tracing/testing - for CS-1 throguh CS-4.

I would be willing to give away one of the two remaining OT-290 (for
free) to anyone who would in return commit to developing a GSMTAP
interface for it.

The message format on the serial UART between phone and PC is documented
(PDF documentation by Sagem included with the phones).  So based on this
documentation and an OT-290 phone, it should be possible to write a
small command-line program that receives the GSM/GPRS messages from the
OT-290 and sends them via GSMTAP into wireshark.

The result would then be similar to what is for DCT-3 phones.

If you're interested, please respond to this message.  Please don't
apply for the phone if you are not able to find the required time and
interest for actually doing the GSMTAP integration.


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

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