Frequently asked questions (FAQs)
Welcome to the AT&T product support center. To get started: select a product category from the left, or enter your model number below to go straight to support and troubleshooting for that product.
Product Troubleshooting
Problem:
I am using my VoIP box to set up my wireless home phone and other network devices. All devices work normally except my phone, which has no dial tone/ displays Line in Use with busy tone/ poor sound quality. What should I do?
Solution:
Tip 1 of 1
Despite your VoIP box shows full signal strength, there could still be no dial tone/ display Line in Use/ etc. This may due to the abnormality of signal and voltage levels. Follow this short video to reset your VoIP box and its connected devices.
(For non-IS8151 series - all other models) https://www.youtube.com/watch?v=mXbXl4froUc&t=25s
(For IS8151-X series) https://www.youtube.com/watch?v=rJ9PNkwBzfE&t=3s
[Background]
• VoIP box connected via SIM/ LAN connection.
• Some VoIP boxes have displays and some not. While displays show steady ON and ready, you might still experience with no dial tone sound/ display Line in Use.
[To Reset]
• Some Power off button does not fully power off the unit. It only put the VoIP box in standby mode. To truly power off, unplug the power adapter of your VoIP box.
• Disconnect all devices from the box. After a moment, reconnect your power adapter, and then press power button to turn ON.
• Wait until the VoIP box is steady ON and ready.
• Connect your telephone cable from your Telephone base to your VoIP box.
REMINDER!!!
• Make sure you didn't connect the telephone cable from the Telephone wall outlet to VoIP box telephone port!!! Doing so will not damage the device, but it will affect the call function and becomes unusable. This is why you experience no dial tone, Line in Use with busy tone, etc.
• During power outage, your landline phone will not be available since it requires external electric power despite your VoIP box has a backup battery.
If this situation persists, contact your VoIP / VoIP box service provider for further support.
Note:
You may want to reference your product manual.
Or view basic troubleshooting tips:
- My caller ID announce (voice announce CID) isn’t easy to understand at times.
- My telephone product is suddenly acting strange or stopped working altogether. What can I do?
- Who is Charlie Johnson and why is his name displayed on my phone?
- My answering system plays my greeting to callers but will not record messages. Why?
- I subscribe to a non-traditional telephone service (for example: magicJack, Skype or Windows Live Call), and my phone is not working correctly.
- My battery pack does not last very long between charges. I am charging the handset more frequently. What should I do?
- I want to dial a phone number found in my Caller ID log, but the number is not displayed correctly. What can I do?
- Why am I not receiving Caller ID?
- Why won’t my answering system record messages?
- How can I reduce static and noise on my phone?
Or view our service and order support tips:
- How do I get status on a product or accessory I ordered?
- How do I find a battery for my AT&T product?
- I want to expand my AT&T multi-handset product, how do I find the handset I need?
- How do I obtain support on my AT&T product that is no longer under warranty?
- How do I obtain warranty support on my AT&T product?