Under certain conditions the following error message may occur in the event log:
4122 - Error initializing DTMF detection. Please ensure you device supports DTMF detection and you have the latest drivers installed.
There are several possible reasons for this error to occur:
Device does not support DTMF detection
This is the most common reason for this error message. Please check the documentation of your device if it supports DTMF detection. Please also make sure that you are using the latest drivers for your device.
If you are using a CAPI based ISDN board: You can check if your device supports DTMF detection by selecting the device (ISDN Interface x...) in the device list and click on Configure. Select the interface in the tree and click Properties. Then navigate to the features tab and check the Tone Monitoring list. If there is only a Software entry but not a Hardware entry, your CAPI driver does not support DTMF detection.
Note: Software detection does not work in the current versions of TERAVoice.
Bug in the TERAVoice Free Version with CAPI based ISDN boards
Please read the appropriate article Q10422 in the Related Articles section.