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All GeSI member companies are kindly invited to use the Sustainability Assessment Framework (SASF).



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Become a GeSI member

Join 40 of the world’s most influential technology companies in building a sustainable world!

Membership of GeSI is open to any company or organisation which, as a principal part of its business, provides a service for the point-to-point transmission of voice, data or moving images over a fixed, Internet, mobile or personal communication network, or is a supplier of equipment which is an integral component of the communication network infrastructure.

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