ISDN compatibility trouble w/SAGEM and 3.3.3

Jay Hennigan (jay@west.net)
Mon, 4 Nov 1996 21:00:36 -0800 (PST)

We have a Mac customer with a SAGEM internal Nubus ISDN adapter. They are
fed from a remote office with 56KB channels, line on AT&T 5E, configured
as National. No problems connecting to our Portmaster running 3.3.1c.

We upgraded to 3.3.3 and 4MB RAM and this customer can no longer connect.
The call comes up and innediately drops. I was at the customer's premise
so couldn't see the Portmaster side of debug, but it looks as if the PM is
immediately dropping the call. Customer sees a "Call failed-Link down"
message.

Here's the weird part: If the customer inserts a long distance carrier
code in front of the (local) number, such as 10288nnn-nnnn, it connects
reliably every time. Obviously, they don't want to pay LD rates for
local calls, but by routing the call through AT&T, MCI, or Sprint, it
works.

Local telco (GTE) says the line checks out fine, and they can call
another PM long-distance.

So, what changed in 3.3.3 that would reject local ISDN calls, and only
from this one type of TA?

-- Jay Hennigan jay@west.net --
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