OK I understand now. And it looks like the issue is with the Zultys System as the Executone System is sending the digits. It doesn't know what it is connected to and is working fine when going to another Executone system. So maybe this can help. Reminder when the incoming digits are expected on and Executone to Executone Tie Line set up each has to have DTMF sender/receiver cards in it.
I.E. A DTMF card is involved to SEE the incoming digits from the Far End System.
From what I Google on the Zultys system it is a VOIP system so it may be looking for packet info?. (Sort of like the 24 channel on a PRI in the Executone System where info is sent?)
Anyway I would suggest looking into the setup of the Zultys system and when connected to an older system, do you need extra hardware (DTMF Sender/Receiver card) that isn't present or being
told to look at things coming in on the Tie Line.


mjc