Why is there an asterisk error?

Question

Asterisk

I don’t understand why an error occurs when making calls via a modem,
Don't know how to indicate condition 33
but there are no problems with voice or communication quality,
an error is observed when you call the modem, followed by additional dialing via DISA, and then the call goes through the SIP provider.

Answer 1

The channel driver cannot process the command AST_CONTROL_PVT_CAUSE_CODE (33) - an extended request for the cause of termination, if I'm not mistaken. The warning is not critical and can be ignored.