I need to disagree with the "retrofit" statement. You need to shop for a PBX based on available support, features, functionality, ease of use, ability to accept industry standard apps, networking capabilty, expansion, longevity, price, etc....... The arguement for a PBX that can support voice via "IP" or both "TDM & IP" could only be an arguement FOR an Avaya, Nortel, Mitel, or inter-tel. 20+ years of experience in call center ACD enviornments can't be picked up overnight by the 3com's, cisco's, shoreline's, etc (not to directly knock on them because some have some good features). Stay focused that what you are really buying a call processing platform. Don't fall victim to the hype. You are not buying a protocol. -CL