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I have previously created an internal app for automated sending of faxes from our back end system which I did in my previous sandbox environment where I had no issues sending faxes from sandbox to my production number during testing but recently I had to make a minor change to the app and wanted to test it in sandbox. My previous sandbox has been deactivated due to inactivate so I created a new one but noticed that any faxes sent from the new sandbox to either the sandbox number or my production extension fail every time. I'm not even talking about sending faxes from my custom app as sending a fax from sandbox extension admin web page fails as well.


I hope dev team is looking at this forum as at this point my sandbox is unusable for testing anything with fax in/out and I did not receive any reply to my email I sent to dev team days ago about this issue :/

What is your sandbox main company number and your app client id?

Sandbox #14242587378 and app client ID msMKEY1VQzidhPMJ56omsg


But note that this app is working fine in prod and once I noticed that fax out was failing in non-modified app code in new sandbox I tried tested fax from sandbox extension admin web portal and it fails there too. It appears to dial out but fails to establish fax connection with either sandbox number or my prod user extension DID. If you can access call log (from 2/11) in my sandbox account you will see the issue.

I just login your sandbox account and send a test fax from there successfully. Can you try it yourself. And in your app, make sure you are using the client id and client secret for sandbox as well.


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Hmm, maybe you have special permissions or I'm running in to some kind of backend permissions issue as I still cannot send even a simple 1 page test page from sandbox account extension web portal. Still fails in call log after 3 attempts and shows failure in Messages > Outbox. On the receiving side the 3 attempts show up as missed call in RC app. I confirmed that my DID is setup for Voice and Fax and it can receive faxes from any other source I tested it with except RC sandbox.

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