The 82 in 0x82EF seems to indicate that the local telco is sending the disconnect because of an "unspecified" protocol error.
Do you have debug info for the sessions that the telco was able to establish? You could then compare your setup parameters with theirs. E.g. do they support 64k or should you set your speed to 56k etc.
Re: ISDN BRI Error: Cause i=0x82EF - Protocol error; unspecified
Gentlemen: Thank you for your responses. I did have many telephone chats with various SBC technicians; but to no avail. I was told that if I use an 11-digit dialer number a la 12121230000 I would get a 64K connection instead of a 56K connection, which eventually proved to be correct. However, instead of a proper connection, the error message changed: "Cause i = 0x82C1 - Bearer capability not implemented." This caused more frustration for me and head scratching from SBC; even to the point of them trying to trace the call and see where the problem started. As you both mentioned, the 82 in the cause code indicated the local ISDN router.
To make a long story short, after going through my routers' settings with a fine tooth comb and finding nothing apparently wrong, I decided to prepend the dialer string with a "9" to see what would happen. It worked! Apparently my ISDN lines do not connect directly to an ISDN switch but through a PBX and then to an ISDN switch. The SBC technicians apparently did not know or realize this fundamental fact.
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