we had this recently and it was a BRI into mitel delievered via SIP NTU - carrier had to set the default link number for diverted calls
do you have a default cpn set on the sip peer ?
If I never did anything I'd never done before , I'd never do anything.....
I had this issue a few months back.
Change the "Override From Header with Default CPN" from No to Yes on the SIP Peer Profile.
This got resolved for us.
Here is my tek tips post
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