All about telecom

Some interesting reference for telecom:

Local Exchange Routing Guide (LERG)

http://www.voip-info.org/wiki/view/LERG

http://www.quentinsagerconsulting.com/utilities/zip_online.php

http://www.localcallingguide.com/xmlquery.php

http://www.area-codes.com/default.asp

http://www.billingworld.com/articles/2010/09/the-new-clec.aspx


http://electronics.howstuffworks.com/ilec.htm
http://www.beatriceco.com/bti/porticus/bell/bellsystem_history.html
http://www.sctelcom.net/site/?q=content/ilec-vs-clec
http://www.voip-info.org/wiki/view/How+to+start+a+Clec
http://www.centurylink.com/wholesale/pcat/interconnection.html

https://www.neustar.biz/resources/infographics/infographic-journey-of-a-phone-call