Signaling System 7
  http://www.asknumbers.com/SS7ISUPMessages.aspx
http://www.c7.com/ss7/ss7_tutorials.htm
http://www.iec.org/online/tutorials/

IP Telephony
  http://www.pt.com/tutorials/iptelephony/

ATM
  http://members.tripod.com/~VBKumar/atm.html

Wireless Technologies
  http://www.3gpp.org/
http://www.iec.org/online/tutorials/gsm/

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