[Asterisk-Users] Weird issues with TDM400P

[Jeremy Gault]

We have a TDM400P installed here with four FXS modules.  It works well 
except for a couple of issues:

First, I have a Panasonic KX-TG2431 telephone (so others can reach me 
when I am in o ther parts of the building) hooked up to one of the FXS 
ports.  When the other end hangs up, I get the usual CPC disconnect 
signal.  After the CPC, sometimes it will go to a dialtone, and other 
times a reorder.  There doesn't seem to be any rhyme or reason behind 
what it does, it's random.  That in and of itself is not a problem, but 
it did seem odd.  However, sometimes during the reorder (after about 3 
seconds) the reorder stops and I get an FSK data burst (assumedly the 
VMWI.)  My understanding is that the data burst isn't supposed to happen 
until *after* my phone goes on-hook.  Any idea what's up here?

Second, one of our ports has static on it.  A tenant moved in and we 
configured their fax for our fourth (until then unused) FXS port.  They 
had numerous fax problems, and when I connected a buttset up to their 
wall jack, there were minor static issues.  I swapped their fax 
connection to a different port on the TDM400P, and the static went 
away.  I put a different line (to elsewhere in the building) into their 
usual fax port on the TDM400P, and the static showed up there.  So, the 
problem follows the FXS port, and not the line itself.  For now, I have 
given them the FXS port I was using for my Panasonic, and put my 
Panasonic on the noisy port.  It's not all that noticeable, but of 
course the fax doesn't like any noise at all.  Any idea what this could 
be?  I haven't done much troubleshooting yet, but I plan on taking down 
the * box and re-seating the FXS module.  If that doesn't work, I'll 
swap it and another FXS module on the board around to see if the problem 
follows the module or the socket.  Other than that, any recommendations?

Third (minor) issue, which affects all the ports, but I am using my 
phone as an example: I can call from my desk phone (Polycom IP 501) to 
my analog phone and answer.  Then I can hit flash on the analog phone, 
and I'll hear the usual double-click on the Polycom as the analog phone 
flashes.  However, between those two clicks, there's some sort of weird 
noise.  It's not a radio station or anything.  It's more like a whine of 
sorts.  The same noise can be heard by hooking up a buttset to one of 
the ports and putting it in monitor mode (where it monitors the line, 
but doesn't go offhook.)  Is it normal for Digium cards to generate this 
noise, or does this indicate something is wrong with my card?  (Our 
Comdial PBX at church does a similar type of thing when flashing on an 
analog extension, but that still doesn't tell me if it's normal or 
not.)  Anyone else see this same type of thing?

Fourth: I get this message in the log (related to our analog FXS ports)
Aug 11 16:46:17 WARNING[23855]: zt hook failed: Device or resource busy

I think this may have something to do with getting a dialtone instead of 
reorder after hangup (the first thing I mentioned.)  Not 100% sure though.

Anyone have any ideas on any of these?  If you can share I'd appreciate 
it.  TIA.

          Jeremy

-- 
Jeremy Gault            <jgault at winworld.cc>
Network Administrator, WinWorld Corporation
voice: +1.423.473.8084  fax: +1.423.472.9465
fwd: 461771             url: http://www.winworld.cc/