Bezoekadres OPTA
Zurichtoren
Muzenstraat 41
2511 WB Den Haag

PO Box 59366
1040 KJ Amsterdam - The Netherlands

Phone	+31 (0) 20 301 2121
Fax	+31 (0) 20 301 2202

CALLAX Telecom Holding GmbH,
Postfach 10 18 35,
40009 Düsseldorf
Tel: +49 180-57 01077*
Fax: +49 180-59 01077*
(*) € 14 ct/min from the german fixed network, mobile and foreign calls may be different

CALLAX Limited
Level 7, Tower 42,
25 Old Broad Street,
London EC2N 1HN
United Kingdom
Tel: +44 (0) 20 7877 0432
Fax: +44 (0) 20 7877 0708