Hi! I'm a new comer.
I have a IWATSU ECS version 3.01 with IX-12IPKTD-E which is controlled by MBU.
The problem is that they work for a certain period then few of them show "Channel Block" on display.
The other TDM phones fine while problem happened.
System Reset needed to resume.
I tested the phone which having such problem in other ECS system, but seems okay!
I really don't know what should I do to fix this!