nortels, symposium, call pilot with ivr ports and desktop apps make a very complete package.. keep in mind that nortel does not make plug and play app's.. if you've got people that can do scripts and make changes on the fly you will not find an app that nortel can't handle.. if you want out of the box system that has default everything and not that many options, avaya, mitel nec are in that market...
everyone here is a nortel tech. i work for a vendor that sells nortel and cisco.. but have worked for vendors that sold all of the above as well as rolm, simmons, figitsu.. i still think nortel brings the most complete package to the table.. a friend of mine (rolm tech) says that after 50 years they found the right answer...
john poole
bellsouth business
columbia,sc