Hi there, I'm cleaning up my cellar and I found a EGM 35 GSM A-Bis field test equipment. Manufacture: GN Nettest ELMI Typ: EGM 35 It is meant to tap in a E1 line and decode messages and also the voice streams between BSC and BS. Comes with headset :) If any body has interest, I am happy to send pictures off-list. Regards Miguel