A:AnswerHere is what VTECH indicates:
VTech
Subject
Product Support
We regret to inform you that the CS6709 and the CS6419 will not work together because they belong to two different model series.
The compatible accessory handset for the CS6419 phone system is the CS6409 while the compatible main base for the CS6709 handset are CS6719/CS6729/CS6758/CS6759/CS6829/CS6859 phone system.
You can find the registration instructions in the Appendix section of the user's manual. To download a PDF copy of the manual, please click on the link below:
https://www.vtechphones.com/support/technical-support
A:AnswerI have a CS6729 base phone and thie CS6709 phone was a perfect match. your asking if it supports the CS6729-3. I'm assuming that's the same base phone I have since that designator means you can have up to 3 extension phones as mine does. Hope this helps.
A:AnswerTry to empty the missed calls log - press the CID button and then Delete (bottom left corner button) any data there that you don't really need to keep.
A:AnswerHi - The VTech CS6709 is an expansion handset only compatible with base models VTech CS6729 and CS6719. The VTech CS6729 is the telephone base that has a built in answering machine. The said telephone base has a play button for you to listen to your recorded messages. For more details, please contact our Consumer Sales and Service Center between the hours of 9:00 AM and 5:00 PM Monday through Friday at 1-800-595-9511.
Thank you,
-VTech Support
