Voice message when receiving SIP Error

Hello, I have a MagnusBilling server to manage SIP accounts and I add these SIP accounts as a trunk in Issabel

I noticed that every time a call receives a SIP 503 response (Service unavailable) it only passes this information to the Softphone/Telephone but does not display any audio message informing that the call failed

What do I need to do so that every time I receive a SIP 503 response, my Issabel (Or MagnusBilling) handles and forwards a voice message to the phone/softphone?

I believe https://forum.issabel.org/ is the forum you are looking for to get
an answer to this question.

Antony.

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