Hi,
just really basic things:
1. let's check if PBXs are connected and can communicate to each other using that VDN
2. check CME settings
(1) - dial the access code you have place for the second PBX plus ERPfrom the phone of the first PBX and then look at TServer log for the second PBX. You should have callOffered, EventQueued, EvenRouteRequest with ThisDN equal to ERP on the second PBX.
If you have this, then we know that it is working. If you do not have it, it means that your PBX is not setup correctly or you have the wrong accesscode-dn.
(2) CME settings sometimes can be a pain in a rear end, but overall you should be able to get it working in no time.
The important things you have to take into account are:
1. create an external routing point fopr BOTH T-Servers
2. under Switch->Access Codes, add the other PBX and add the access code (which is usually accesscode)
3. repeat the same thing for the other Switch (add access code and ERP for Switch A to Switch B)
4. make sure that TServer A has TServer B as a connection and TSErver B has Tserver A as a connection
5. make sure that server-id option TServer A and TServer B is different (set it to 101 and 102 for example)
6. to make it easier to debug make sure that you have this for log-trace-flag in TServer options:
+iscc +cfg$dn -cfgserv +passwd +udata -devlink -sw -req -callops -conn -client +asai_dump
7. match-calls-by inis usually set to "UUI" for Avaya
Here are some screenshots of how my sample switches are connected in CME:
I have two switches : F** and O** (ignore the ***)
Here is the screenshot of how F** witch is connected to O** switch:
[attachimg=1][attachimg=2]
[attachimg=3][attachimg=4]
Do you have it set up like this?
If you could post us the log it would make it really much easier

Best regards,
Vic