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TELES AG Informationstechnologien
Industry Telecommunications, next-generation networks
Founded Berlin, Germany (1983)
Headquarters Berlin, Germany
Key people
Sigram Schindler CEO, Oliver Olbrich COO
Frank Paetsch CTO

TELES AG Informationstechnologien is a provider of equipment, solutions and services to fixed, fixed-mobile convergence, and Next Generation Networking (NGN) service providers.

The company was founded in 1983 as TELES GmbH by Professor Dr.-Ing. Sigram Schindler in close cooperation with the Technical University of Berlin. Professor Schindler lectured in telecommunications at the university until 1998. In 1997, he was voted High-Tech Manager of the Year by Manager Magazine in Germany.[1]

Active in VoIP technology development since 1996, the company's main development and operational focus lies in the areas of IMS and NGN.

TELES supplies service providers with complete Class 4 and Class 5 NGN Softswitch solutions. TELES NGN Solution is a standard based, scalable architecture aimed at minimizing integration time and allowing quick deployment. The solution includes hosted voice functionality which enables residential VoIP services, hosted PBX (IP Centrex) services, Fixed-Mobile-Convergence, IP Trunking, and additional value added applications. Classical NGN/PSTN applications like Wholesale, Long Distance, and NGN backbone services are also available with this solution.[2]

The TELES product portfolio also includes VoIP gateways and mobile gateways for GSM, CDMA, and UMTS networks.[3]


  • 1990 ISDN product development
  • 1992 ISDN PBX development[4]
  • 1993 Least-Cost-Router development
  • 1996 First major VoIP patent - IntraSTAR dynamic PSTN fallback[5][6]
  • 1998 TELES is floated on the stock market and becomes an AG (public limited company)
  • 1998 Introduction of clustered switching system for PSTN
  • 2000 First public network integrating VoIP using H.323 protocol
  • 2001 First highly integrated GSM and CDMA mobile gateway developed
  • 2002 First integrated mobile VoIP gateway developed
  • 2003 First centralized SIM server for mobile gateways developed[7]
  • 2004 STRATO AG, a webhosting TELES subsidiary, is sold to Freenet[8]


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