Hello & Welcome to Just Answer,
Sorry I didn't see your question earlier.
To help you with this issue, may I ask:1) Have you tried connecting the CS6429-4 base unit to your Ooma device and have any particular issue with it working properly?
2) If so, has the Vtech system been TESTED and works - when connected to a different service provider's phone lines?
I only ask because this Vtech system - or any other "standard" cordless phone should work well when connected to an Ooma device.
Please let me know if you have any more specific questions or issues.
Thanks, ***** *****
I see it has been a few days and I just wanted to follow up to see if you have any more questions concerning this issue or if the issue was resolved.
I look forward to any further questions or results that you may have.
Thanks, ***** *****--. .-(im)