Softswitch 
Subtitle: Architecture for VoIP (Professional Telecom)
Publisher: McGraw-Hill Professional
Published: December 10, 2002
Language: eng
Number of pages: 359
ISBN-13: 9780071409773
First sentence: In 2000, the telecommunications boom went bust, and the reason was that new market entrants, known as Competitive Local Exchange Carriers (CLECs), were forced to compete with Incumbents Local Exchange Carriers (ILECs) on the terms of the incumbents.