You miss read
Were did I say that Toshiba is the only one that allow backward compatabilitly? I will leave it at that since I have read some of your other post were you jump to conclusions.
I am going off of my own experience as you are. We have a 1 yr old CTX system with a couple of 10 yr old cards in it. We are running over 50 extension off it with 11 incoming lines (more then the 8-15 you stated) and everything is working great. The management software is always being upgraded as is the systems software. You must ensure you get the latest release in order for your system to work effectively. I would go into more detail in our current system but we have a beta version of the system software (we were at the right place at the right time).
In future post could you please refrain from making post that are attacting in nature. We are here to make suggestions not attact one another.
