dear all,
how to configuration of "CCIS over IP" by 3 different PBX location ?
1. PBX-1 with prefix : 2xxx
2. PBX-2 with prefix : 3xxx
3. PBX-3 with prefix : 4xxx

What are you interesting ? Programmig or hardware configuration ? Please to make the information more precise.

i wish to program at each PBX. I use at each PBX is :
1. PBX-1 :- IPPAD and MP24+Ethernet, 2xLCA
- Point Code :00001
- license : 1 x CCIS
2. PBX-2 :- IPPAD and MP24+Ethernet, 4xLCA
- Point Code :00002
- license : 1 x CCIS
3. PBX-3 :- IPPAD and MP24+Ethernet, 3xLCA
- Point Code :00003
- license : 1 x CCIS

How to programming at each PBX ?

there are alot of program need to set..
CMA7 / CM8A / CM20 / CM8A / CM85 / CM5B
CM14 / CM07 / CM30 / CM35 / CM05

It isn't very simple.

You can find some information on this perfect site
https://www.2000stuff.com/