Few numbers doesnt works properly

Goodmorning everyone
Is there someone who want to help me about finding out why there are few numbers that doesnt works properly?
i’ve managed to fix most of them, but there is still one who drop few seconds after theyr IVR start talking (this doesnt happens if i use mobile phones who are not on the PBX line)
and another one is a problem with a specific provider (or at least i think so)

first of all, what kind of info should i post to start?

thanks in advance for the help!

It will help to show us the Asterisk CLI shows during those failed calls. Also, what kind of trunk are you using for this outbound calls? If it’s SIP, a packet trace would also help.
https://wiki.freepbx.org/display/SUP/Providing+Great+Debug#ProvidingGreatDebug-FreePBXCLIDebug

https://wiki.freepbx.org/display/PPS/Capture+TCPDumps

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