Hi Gunther,
Analog boosters are a good solution to the VG224 long-loop limitation. I don't know that you need something specifc to EMEA as long as the booster can drive the current, ring voltage and frequency. Do you require supp-services like VMWI, stutter-tone?
You can try reaching out to these guys for more info on boosters.
http://www.phonegeeks.com/phlipoboinnu.html
Also, You should look at our new VG350 analog gateway. THe VG350 supports up to 96 OPXLite long-loop ports. These ports have been tested at 18,000ft (~5,400m) using 24AWG wire. Today you need CCM 8.6.2(su2) or higher. But, VG350 also supports SIP and H323 trunks, so you can add it to a CCM 6 cluster as a SIP gateway and change the config once to the CCM is upgraded to SCCP if the customer is looking for advanced supp-services.
You can reach out to me directly or visit http://www.cisco.com/en/US/prod/collateral/voicesw/ps6790/gatecont/ps2250/data_sheet_c78-710996.html
for more information on VG350. The VG350 supports many new features and would probably be good to show the customer.
Thanks
Tony Banuelos