Is IP Centrex legal?

	UC strategies with Matt Brunk
	What is the difference between E&M and junction lines, and do you have any advice on how to check faults in these?
	How can MPLS help in VoIP implementation between a parent company and its branch offices?
	What is the difference between a proxy server and B2BUA when it comes to SIP? How can I decide which one I should go for?
	Can virtualization's benefits apply to UC?
	How does one cope with echo in a VoIP-enabled network? What's the best way to use an echo canceller?
	Does implementing VoIP security affect the QoS? How would one handle it, if it does?
	Successful UC assessment team structure and methods
	Do hosted and managed UC systems provide more benefits for certain enterprises?
	Security concerns for migrating from open source VoIP to UC
	Convergence and open source solutions the next big things in UC

	IP Telephony Systems
	What are the operational costs associated with VoIP after implementation?
	Unified communications infrastructure virtualization now a reality
	HD voice value proposition: Just try using an HD phone
	Tutorial: Connecting and leveraging VoIP islands
	VoIP islands 101: How did we get here?
	Do desk phones matter in the UC everything, IP everywhere era?
	The new Nortel: LTE patents reviving Nortel?
	Eldorado Casino can't afford to gamble on IP-PBX telephony upgrades
	Agito first to make BlackBerry a dual-mode phone
	Nortel voice customers are the vendor's only enterprise asset