Hi Celio.
Firstly I would look at the TE configuration, just make sure it is in-line with what the carrier has provided you on your ISDN line, then check and make sure that the Layer-1 Is made permanently active by the carrier.
Can you do a "debug isdn q931" and capture what happens when you go to make the 3rd call, don't forget to do a "term mon" to capture the debug.
Cheers,
David.
Cheers,
David Trad.
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