Conférence Européenne des Postes et des Télécommunications (CEPT)

CEPT was founded in 1959 by the European national PTTs. Currently, not the PTTs but the governments of 34 European countries are members.

European Telecommunications Standards Institute (ETSI)

In 1989, ETSI was founded to take over most of the CEPT standardization activities, such as

Not only PTTs, but also other operators can participate in ETSI.