All I would be interested if the current cvs zaptel, has fixed any callerid check sum fails on x100p's. Mark worked on an issue i had with a false 2nd ring detection from the fxo ports on a CAC Adit 600 interfaced to a T400. He added logic to the zaptel driver to ignore a 2nd ring detection if it comes to close in ms to the first ring detection. A false 2nd ring detection could cause the fsk tone to not be detected or the callerid extraction from the callerid fsk tone to fail bcus it would stop reading from the zaptel interface before the extraction of all callerid info was obtained. hand ups if this has helped or post error messages if you see any new warning/debug msg after installing...