Brian- You are correct. There are upgrades to TDM systems.
#1- The TDM upgrades are few a far between compared to constant updates, software patches, switch upgrades, and cabling upgrade requirements that accompany almost every VOIP install. The VOIP ROI is a scam. You get an ROI on TDM too. The big difference is with TDM you invest less, and get the ROI on the equipment faster. We all understand that times are hard and we need to find ways to cut back. But if your business relies on your telephone system working, and that don't mean working SOME of the time, you shouldn't go with a full VOIP solution.
#2- If you are honest with your clients you will tell them that they can have VOIP if they want it. You at least have to offer it to them. After all, they probably approached you about it in the first place. But, if you are telling your client that VOIP is just as good, or as reliable as a TDM system, YOU ARE LYING. The two platforms are totally different. One is extremely reliable. One is not very reliable at all. 99.999 up time is a hard number to beat. Show me one VOIP manufacturer that can come close.
That's my opinion on the subject, and we all know what they say about opinions.
