I have a set of pbx-s CCIS-d together as follows:
IPS2000---ICS2400---SV8500---IPS2000.
When I call over from the first IPS2000 to the last one, I do see the caller's extension and name. When I call from the first IPS2000 to the SV8500, it doesn't show the name/number.
When I call from the last IPS to the ICS2400 it doesn't show the name/number. When I call from the last IPS to the SV8500, it does show the name/number.

So, first to last IPS2000 DOES work, meaning the name/number information is there the whole route. Yet, under certain circumstances, it doesn't show on the called terminal's screen. Any idea what to look at?