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- HP Community
- Poly Phones
- ATA / VoIP Adapters
- Re: Poly ATA 400 qnd DTMF tone problems

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12-03-2025 08:47 AM
Thank you for the information, @abisset
I’m sorry to hear that you’re experiencing issues with DTMF during your calls. I understand how important reliable call functionality is, and I’m here to help. Please follow the troubleshooting steps below and let me know once you’ve checked them so we can move forward effectively:
1. Verify DTMF Settings:
Ensure that the DTMF settings on your phone are correctly configured to use SIP INFO for all calls. This is typically set within the phone’s configuration parameters.
2. Check SIP Server Configuration:
Confirm that your SIP server or service provider supports DTMF via SIP INFO. Some providers may have specific requirements or may not consistently support this method.
3. Review Network Conditions:
Network issues such as packet loss, latency, or jitter can affect DTMF signaling. Please check the stability and health of your network to ensure these factors aren’t interfering.
4. Confirm Compatibility:
Make sure all devices and network components involved in the call path support SIP INFO for DTMF tones.
5. Analyze Logs:
Check the call or debug logs on your Poly phone for any errors related to DTMF handling. This can provide valuable insights into why subsequent calls may be failing.
6. Verify Outbound Proxy Settings:
If your phone is configured to use an outbound proxy, confirm that it is forwarding SIP INFO messages correctly.
7. Review Client-Side Configuration:
Check whether your device has fallback DTMF methods enabled (such as RFC2833) in case SIP INFO fails. This can help provide redundancy.
8. Check Codec Compatibility:
Ensure that the codecs used during the call are recommended and compatible with SIP INFO DTMF signaling.
Take care and have an amazing day!
If you would like to thank us for our efforts to help you, go to the public post and give us a virtual high-five by clicking on "Yes" for the question "Was this reply helpful?" below my message, followed by clicking on the "Accept as solution" on my public post.
Regards,
Salman
I'm an HP Employee.
If this reply helped resolve your issue, please select the Accept as Solution as it helps others in the community quickly find the answer they’re looking for.
And if you found this reply helpful, clicking Yes below is a great way to let us know we’re providing the support you need, as it encourages us to keep improving and sharing helpful guidance.
12-05-2025 10:08 AM
Hi there! @cpudoctor7210
We haven’t heard from you, this post is in reference to the thread you created on your friendly neighborhood (HP Support Community).
I would like to know if the resolution we provided worked for you.
If you have any other queries, feel free to reply at any time, and thank you for being a valuable member of our HP Family.
If you would like to thank us for our efforts to help you, go to the public post and give us a virtual high-five by clicking on "Yes" for the question "Was this reply helpful?" below my message, followed by clicking on the "Accept as solution" on my public post.
Have a great day ahead!
Regards,
Meghana
I'm an HP Employee.
If this reply helped resolve your issue, please select the Accept as Solution as it helps others in the community quickly find the answer they’re looking for.
And if you found this reply helpful, clicking Yes below is a great way to let us know we’re providing the support you need, as it encourages us to keep improving and sharing helpful guidance.
12-08-2025 06:07 AM
Hi @cpudoctor7210, I hope this message finds you well.
I wanted to follow up on the query that we discussed earlier and confirm that it has been successfully resolved.
If you still need further assistance or have any additional questions, please do not hesitate to reach out to us.
We are here to assist you and provide any necessary support.
Regards,
Meghana
I'm an HP Employee.
If this reply helped resolve your issue, please select the Accept as Solution as it helps others in the community quickly find the answer they’re looking for.
And if you found this reply helpful, clicking Yes below is a great way to let us know we’re providing the support you need, as it encourages us to keep improving and sharing helpful guidance.
12-11-2025 06:34 AM
@cpudoctor7210 Hope you're rocking an amazing day! Since we haven't heard from you yet, we will be archiving this case for now; however, you can respond to the same thread to continue the conversation.
If you need any more help or just want to say hi, we're here for you - just a message away!
Take care and stay fantastic!
Regards,
Meghana
I'm an HP Employee.
If this reply helped resolve your issue, please select the Accept as Solution as it helps others in the community quickly find the answer they’re looking for.
And if you found this reply helpful, clicking Yes below is a great way to let us know we’re providing the support you need, as it encourages us to keep improving and sharing helpful guidance.
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