[cisco-voip] overhead paging system integration

[Mark D. Nagel]

After having exhausted all my normal avenues of research (including
TAC), I thought perhaps someone here has run into the same problem I'm
currently tackling.  I have a site recently migrated to CCM from an
older Siemens PBX.  The site has a custom overhead paging system that is
as simple as can be imagined -- tip and ring link to speakers and when
this is connected to with the old system, voice is transmitted over the
paging system.  We initially thought we could just link to an ATA-186 or
an FXS port, but this thing looks like it is off-hook constantly, so you
can't only do that.  I also tried to put a Valcom V-9940 Paging Adapter
in the middle, but my layer 1 skills are limited and the solution failed
(I may have selected the wrong wiring configuration).  My question to
the list is, has anyone come up with a method to link CCM into overhead
paging systems, and if so, would you be willing to share your solution?

Thank you,
Mark