I have ATA devices that register in Call Manager 4.0 but no dial tone on the analog lines.When you ring the ATA analog phones call manager gives a ring tone but the analog phone does not ring The ATA devices is at a remote site from the Call Manager. IP Phones work ok at the remote site. When you at the ATA 186 device as a phone and dial the number you get a busy signal. If you bring the ATA device on the same network as the call manager it works fine. I should not be a QoS issue since IP phones work ok from the remote site. I am wondering if duplex or speed or QoS is the issue.
It sounds to me like you have a codec issue. What is the value in the "Rxcodec" and "Txcodec"? If the ATA is remote, the value for both fields should be 3 which sets the codec to G729. You also need to set the codec to G.729 in the CallManager.
