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[thomas at klettke.us]

Perhaps someone with more experience can help me solve this puzzle:

Asterisk 1.4.18 on a Dell PowerEdge SC440, CentOS 5, 2.6.18-53.1.14.el5,
Digium TDM400 with 3FXO(1-3) and 1FXS(4)

Phone service is provided by XO Communications via their XOptionsFlex
service (5 analog lines, 3 of which are used by Asterisk).
For simplicity I refer to them as xx43, xx44, and xx45 - based on their
phone numbers. They are connected to the Digium as follows:

xx43 = FXO 1
xx44 = FXO 2
xx45 = FXO 3

Here is the problem:
When I connect the Asterisk box to the analog lines the first two lines
(xx43 and xx44) will instantly switch to "busy". xx45 works fine -
incoming and outgoing calls work as expected.

I had XO check the lines - all three lines are programmed the same in
their equipment. The work OK - until they are connected to the PBX -
when xx43 and xx44 instantly switch to "busy".

I checked the lines with an analog phone: Each line wokred fine when I
plug an analog phone into it.

I suspected that my FXO ports 1 and 2 may be bad. Thus I connected FXO 3
- which is working with xx45 - to line xx43 and then xx44: They went
"busy" right away in either case.
I connected FXO 1 and then 2 to line xx45: Worked fine both times.

I replaced the entire TDM400 with another card, and repeated the above
tests - the results were the same as above.