This IDC study highlights the shipment and revenue market shares for enterprise IP PBX (pure and hybrid) systems, IP telephony lines/seats, and desktop hardware IP telephones for 2007.

"While the arrival of Microsoft and IBM's unified communications solutions have stimulated a lot of dialog and market hype around IP telephony, these solutions have only just begun to dampen the growth of existing IP PBX shipments and IP lines from the existing telephony providers," states Nora Freedman, a senior analyst in the Enterprise Networks group at IDC.