Mostly an error caused by the provider when the addr=00000000
I once had a problem with a ISDN connection having 3x100 DDI/DID numbers they took the range 2xx and 3xx and transferred it to a SIP trunk. When we called one of the new sip numbers they cam in on ISDN as well on the SIP trunk and i got the same error.
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It works! Now if only I could remember what I did...
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