Troubleshooting Guide for VoIP Feature of DSL Modem Router
VoIP is a common feature of DSL modems and routers, and we may occasionally encounter anomalies when using it. If you experience challenges with registration or call connectivity, the following guide will provide you with efficient support.
Section A: VoIP Registration Process
1. Prepares for Registration
- Ensure your DSL modem router has stable internet connectivity before the VoIP setup.
- Confirm you have the correct account credentials (phone number/password) from your VoIP service provider.
Note: It is recommended that you manually enter your phone number/password; copying and pasting may result in errors.
2. Step-by-Step Registration
- Access your modem router settings interface. How to log into the web-based interface of the AC VDSL/ADSL Modem Router.
- Navigate to Advanced>>Telephony/VoIP>>Telephone Numbers, and click Add.
- Input the registration details provided by your VoIP service provider.
- Validate the registration status: A checkmark indicates successful registration, while a crossmark indicates the opposite.
For Detailed Instructions, please refer to How to setup my VoIP function.
3. Troubleshooting unsuccessful Registration
- Double-check and verify information such as phone number, password, and Registrar Address.
- Change "Bound interface" settings in the Advanced Settings section to "Any WAN" or the internet connection interface you are using.
- Disable the "Via IPv6" option if you have enabled it and try registering again.
Navigate to 'What to do if the registration fails' at How to set up my VoIP function for more troubleshooting steps.
If you encounter any other anomaly after registering for VoIP, please provide the following information to help us follow up on your case as quickly as possible:
- Who is your Internet Service Provider (ISP) and VoIP service provider?
- Provide a screenshot of how you filled in the VoIP registration page.
- Provide a screenshot of the VoIP registration information provided by the VoIP service provider, if possible. Please blur sensitive information such as phone numbers and passwords.
- Outline the troubleshooting steps you have already taken and the results.
Section B: VoIP Service Functionality Scenarios
1. Call Information Display Irregularities
- Ensure modem router firmware is up-to-date.
- If possible, prepare another modem router with the VoIP feature for testing and comparison.
Refer to dedicated FAQs:
Incoming calls do not display the caller's name
No phone numbers are displayed for incoming calls or outgoing calls
2. Inability to Place or Receive Calls
- Make sure telephony is registered correctly.
- Ensure modem router firmware is up-to-date.
- Turn off SIP ALG and delete Call Blocks.
Refer to dedicated FAQs:
Unable to call out via the Internet with TP-Link Telephony modem router
Unable to receive calls via Telephony service with TP-Link Telephony modem router
3. Call Interruptions or Dropped Connections
- Disable SIP ALG, go to Advanced >> Click NAT Forwarding on the left >> Click ALG >> Disable SIP ALG >> Save.
- If using an older modem router, test VoIP functionality to isolate device-specific concerns.
- Ensure modem router firmware is up-to-date.
If the above descriptions do not cover your situation, you are welcome to add information, including but not limited to the following:
- Who is your Internet Service Provider (ISP) and VoIP service provider?
- Model number, hardware version, and firmware version of your TP-Link device;
- Screenshot of how you fill in the VoIP registration page.
- If possible, provide a screenshot of the VoIP registration information supplied by the VoIP service provider. You can blur sensitive information such as phone numbers and passwords.
- Outline the troubleshooting steps that have already been undertaken and the results.
Any further feedback is welcome, including troubleshooting results, specific details, or suggestions for supplementing or optimizing this article. We would appreciate it if you could start a new thread in the DSL Modem Routers Board.