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Try the websites of various hardware/software manufactuerers in the telecom business (i.e. Cisco, Lucent Technologies, Avaya, Nortel, Nokia, Sieman's, and/or Alcotel. You would have had a better time listing your question in the title bar instead of "hi". I looked only out of curiosity. Most of these websites will have the info you'll need you could also look at http://www.bicsi.org/ Dependant upon your interests.