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Only established identity federations can join eduGAIN. Individual organisations and services first have to join an existing identity federation that already is eduGAIN Member in order to become eduGAIN-enabled. Depending on the federation, enabling a service for eduGAIN consists of a legal step (signing a document) and a few technical adapatations (configuring services to accept SAML assertions from eduGAIN entities). If a service or organisation already is federated, the efforts to become eduGAIN-enabled in generally are small. From a commercial vendor's point of view it is to first find an identity federation that already is participating in eduGAIN. Next step would be to become member of that federation and then in a second step become eduGAIN-enabled with the help of that federation. Becoming member of federation is free in most federations. Some federations will charge fees to expose a service of commercial vendors to eduGAIN.
What does IdP, SP, DS, Interfederation, etc. mean?
Please have a look at the terminology page for learn more about some of the most used acronyms and terms.