Don't know if I can help but let me get this straight in my head first.
Executone system had a Regular T1 card in it and you connected that T1 to
the other system? Also how is that set up Line Type on and T1 Type in the B-Screen.
Also you have a PRI card in the Executone system and call come into it and then user
attempts to transfer the call over the Tie (T1) line to the other system and it disconnects.
But extension calls to the other system over the Tie (T1) works it just does not keep the
PRI call connected after transfer.
