GSM Patent/IP licensing cost?

My company is planning to develop a commercial BTS simulator test box
(for handset testing)
and we will or have developed our own DSP implementation of the
GSM/GPRS PHY.
However, we will still need to obtain licenses from the essential
GSM IP holders (Nokia, Ericssson, Siemens, etc).

I have read that for handsets the total royalties for GSM patent IP
are 20-30% of the GSM handset cost (not sure if retail or wholesale
cost).

In our case the piece of test equipment will sell for a price
of 200-400 K, but at low volumes.
Does anyone have any guess as to what type of royalties these
companies will ask for? I want a general idea before contacting them.
Thanks.

8631000

.

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