What do you mean pure IP? Do you mean a system that cannot do TDM at all or simply one that is PC based? All three systems that we sell can be all TDM OR all IP or a mix. That would be ESI, NEC (Aspire) and Tadiran. Application is everything before we present a system to a customer. Quite honestly I have yet to run into an application that using VOIP internally makes any sense at all with the way you can move phone with admin software nowadays unless you want to use softphones and/or video conferencing. NEC and Tadiran have really nice conference bridge capabilities and have real analog ports. The nice thing with TDM analog ports is that you know a fax machine or modem is going to work. SIP phones in the office are worthless IMHO and if you are going VOIP use MGCP phones because they have all the functions of a regular TDM phone. DO NOT underestimate how many simple (taken for granted)features you can lose on an all IP system BTW. Remember 75% or greater of the networks out there cannot handle voip, so you better have a handle on a good line of POE switches with QOS. The other thing is that the people running the voip system, their IT people, need to understand what they are doing. Most don't and they will simply blame you when their network fails.
