Swisscom
Swisscom (Switzerland) Ltd.
IP-Plus engineering, Postfach, CH-3050, Bern, Switzerland
+41-58-221-98
Türk Telekom
Türk Telekom International
H-2040 Budaörs, Edison utca 2.
+36 1 801 1617
S3 Company Ltd.
Bulgaria, Sofia, 1574, blvd. Shipchenski prohod 63
+359 88 661 8006