I apologize for not answering this a long time ago, but I did not receive a notification that you had even opened this ticket.
None of the settings should cause the calling party (from the telco) to hang up. The only option that could possibly effect that would be the WINK Supervision. With Wink Supervision, when the TA's FXS port gets answered, the TA sends a "11" for 250 ms, followed by a "00" (this is the 250 ms 'wink') and then a "11" which stays "11" until the FXS port is hung up. So if the T1 is IMMEDIATE Supervision instead of WINK then it could see the "wink" as the call being answered and then immediately hung up. For IMMEDIATE Supervision, the TA sends a "11" when the FXS port is answered and it stays at "11" until the port is hung up.
Again, sorry for the delay in answering,