Inbound calls stop working on one SIP number

I have customer who have Issue their inbound for one number stop working after call made to that number few days ago. Provider check on there end said Asterisk should not be sending a 183 Session Progress followed by a 503 Service unavailable.

How to track this and what can be the Issue?
Any help Please?


There is nothing wrong with 183 followed by 503, other than that 503 indicates the call has failed. 503 is pretty much the catch all failure code, so you need to look at the full log to understand what actually went wrong.

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