How to judge if the callee got through while used dahdi interface

May I ask how to judge if the callee got through while I used dahdi interface ?

I dialed with dahdi , the channel status had already shown line up when my phone was still ringing .

Use ISDN rather than analogue, or use a network operator that reverses line polarity on answer, and configure DAHDI to use that (using it when the operator doesn’t provide it will result in the call never being treated as answered.

Generally, if doing anything non-trivial, your interface with the PSTN needs to be ISDN, either directly, or via a VoIP provider.

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