- International Telecommunication Union
- www.itu.int
- American National Standards Institute
- www.ansi.org
- Standards Committee T1 Telecommuncations
- www.t1.org
- The Telecommunications Industry Association
- www.tiaonline.org
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- European Telecommunications Standards Institute
- www.etsi.org
- The Internet Engineering Task Force
- www.ietf.org
- Institute of Electrical and Electronics Engineers
- www.ieee.org
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