Hello, We are using a TDM400p with 4 FXOs and SIP phones in a high call-volume environment. At least twice a day there are complaints of 'dropped calls'. Examining the debug logs, I see that in each case, an "on hook" event is detected, followed by the zap channel being hung-up and * saying "BYE" to the sip phone: Jun 23 14:17:22 DEBUG[2441232]: Exception on 22, channel 1 Jun 23 14:17:22 DEBUG[2441232]: Got event On hook(1) on channel 1 (index 0) We are using fxs_ks, and neither 'callprogress' nor 'busydetect 'are being used. What could possibly signal these hangups? On each of the incoming analog lines, there are splitters to unused analog phones ('bat-phones' .. just in case) ... is it possible that this is the source of the problem? Zaptel from 2004.06.14 CVS. Asterisk from 2004.06.02 CVS Thank you -- .................. Ryan Courtnage Coalescent Systems 403.830.9410 ryan@voxbox.ca