FRAMINGHAM (12/01/2003) - A report released last week from Dell'Oro Group Inc. shows that enterprise IP PBX line shipments in the third quarter reached 1.53 million, double that from the same quarter a year ago. Line shipments also grew by 23 percent over the previous quarter, the Dell'Oro report says. The market leader is Cisco Systems Inc., which saw its line shipments grow by 58 percent over the third quarter of last year. Nortel Networks Corp. was second in terms of line shipments, followed by Avaya Inc., Alcatel SA and Siemens AG. Avaya saw the second-best growth spurt in the market last quarter, increasing its shipments by 28 percent.