Go to and read these topics:JMO44 wrote:I have the premier service. My OOMA Telo is wireless (with the OOMA adapter). I have a multiple handset cordless phone system (V-Tech, DECT 6.0). Whenever I am on a call and press the "flash" button to accept another (call-waiting) call, I hear a dial tone and I am disconnected from my original call. This is very frustrating and none of my troubleshooting has solved the problem. Please...help me solve this problem! Thanks.
I'm not sure but I think you need at least one Ooma Telo Handset for this to work correctly.
Also you can contact Ooma Customer Service and find out for sure from them:
Phone: 1-888-711-OOMA (6662)
Monday-Friday 7am-7pm PST
Saturday-Sunday 8am-5pm PST