I just upgraded my modem to the new 'cube' one, and am now having this problem. I reset the modem, the phone works for a while, then goes to the 'stutter' tone (busy signal) a while later. I have a technician coming tomorrow. I'm sure they will just swap the box.
Hello, all. Thanks for reaching out to us on the forums. I apologize to hear there are issues going on with you landlines. I would like to look into this and see what's going on. Almost sounds like numbers are not properly provisioned on the modems. Please send me a PM with your first and last names so I may further assist you.
To send a private message, please click my name "ComcastMichael" then select "Send a Message" on the right side.
Thank you for that information, ghoofie. I hope the tech was able to get things resolved for you. If not feel free to start a new thread and we can take a look. For everyone else, I have not heard back from you. If you still need assistance feel free to start a new thread.