asterisk users - Feb 2014 - PRI Error on span 1: Received MDL/TEI management message, but configured for mode other than PTMP

We are seeing the message " PRI Error on span 1: Received MDL/TEI
management message, but configured for mode other than PTMP" on one of our
Asterisk boxes on a PRI.   A Google search turns up a number of hits for this
error, but they are all for BRI not PRI.

I'm reasonably sure there are no recent updates or config changes.

Running Asterisk 1.4.37.  We can update to 1.4.44 if it will help.   At this
time we cannot upgrade to anything later.

Does anyone know how I might troubleshoot this?

MDL/TEI is pretty low level.

Which card are you using?

chan_dahdi.conf?

Card config?

PCAP trace? Q.931 and Q.921 messages are relatively easy to debug with
wireshark.

jg