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Winfried Trenkle has extensive experience in the telecommunications and consulting sectors, beginning a lengthy tenure at Bosch Sicherheitssysteme Engineering GmbH from January 1985 to January 1994, focusing on service and planning for fire and emergency alarm systems. Winfried then progressed to Bosch Telecom from February 1995 to January 2000, where responsibilities included consulting for integration, data, and ISDN solutions. A role as Design Consultant for Networking at Tenovis followed from February 2000 to December 2003. Winfried worked as a Senior Consultant at Avaya from September 1975 to April 2022, specializing in VOIP technologies. Additionally, Winfried has contributed to Sport-Club Freiburg e.V. as a MiniJob support for ICT since April 2020 and has been registered as Arbeitslos with BAfA since April 2022.