Hi, We've a lot of problem with FAX machines connected to ATA devices. When the fax machines place a call (off-hook) to a external line (FXO connected to a PSTN) and then end (on-hook) it not release the call blocking the ATA and FXO, with supervisory disconnect configured in FXO solve the problem partially because in certain scenarios the lines connected not send dual tones.
Can help us, and tell why the ATA not release the call when the Fax machines goes on-hook?..
Call Manager 4.1(3)sr5b
ATA 186 SCCP11.8-2-2SR1S
C2851 IOS 12.4(12)
Thanks in advance,