Hi Jaakie.
Do you have DTMF receiver (REG, MFU or VMU)?
You can do internal loop with 2 circuits in BTU-E and you can verify if your call is ok.
I suggest check the following commands.
1007 to 1012 and 1017 (YES).
1101 to 1104 to operator extension (200)
1023 (2)
1201 (9) Continuous E&M...
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