I have two CME one with ver 3.3 and other vith ver. 4.(0)1. I've made connection between them over serial link. Every telephones from side of CME 4.(0)1 can call any telephone on side of CME 3.3 but in opposite direction it's not possible. I've checked configuration but I cannot find mistake. Pls any advice or comment.
I tried to connect these two CME with H.323 and SIP but the results are the same.