I am experiencing an FXO disconnect problem when i configure the gateway as MGCP but the problem disappears when i configure the same gateway for H323. I have tried recording the disconnect tones, configured cadence, frequency, tried using our region cptone but to avail. Infact our region cptone works for h323. Am thinking maybe the MGCP call control is not detecting supervisory disconnect at all. Is there some special settings i can set in the callmanager service or somewhere else for MGCP to work ? Is there a difference between MGCP and H323 FXO disconnect problem? I have CCM 5.1.2 and 2801 with IOS 12.4T.