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.
How do is set this on the ATA device.The ATA device is in the correct Device pool and therefore has the correct codec which is G.729
You need to set the codec in the ATA as well. From the PC, open a Web browser and enter this URL: http://
Set "Rxcodec" and "Txcodec" value to 3 which sets the codec to G729 in the ATA.
I am using ATA 186
Refer to the following link:
I think in SCCP the field is called LBRCodec. See the following link: