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Voicemail not detecting for US T Mobile numbers.
# support
l
v
This is a known issue: Vapi voicemail detection often fails for US T-Mobile numbers, resulting in "Silence Timed Out" even when detection works for other providers. As a possible workaround, try increasing your timeout settings in the configuration:
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json
{
  "machineDetectionTimeout": 45,
  "machineDetectionSilenceTimeout": 8000
}
If the issue persists, there is currently no documented fix—monitor for updates or contact Twilio support for further assistance. [See documentation](https://discord.com/channels/1211482211119796234/1336407849806462976) Sources: - [Discord: Vapi voicemail detection US T Mobile numbers](https://discord.com/channels/1211482211119796234/1336407849806462976) - [Vapi voicemail detection configuration options](https://docs.vapi.ai/phone-calling/voice-mail-detection)
There are known issues with Vapi voicemail detection not working reliably for US T-Mobile numbers, often resulting in a "Silence Timed Out" status. One actionable step is to increase the 
machineDetectionSilenceTimeout
value to accommodate longer silences in voicemail greetings. Try updating your configuration as follows:
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json
"voicemailDetection": {
  "enabled": true,
  "provider": "twilio",
  "machineDetectionSilenceTimeout": 8000  // Increase to 8000 ms (8 seconds)
}
If the issue persists, it may be due to provider-specific limitations for US T-Mobile numbers, as no confirmed fix is documented in the found information. Sources: - [Discord report on Vapi voicemail detection issues with US T-Mobile numbers](https://discord.com/channels/1211482211119796234/1336407849806462976) - [Discord discussion on Silence Timed Out status and troubleshooting](https://discord.com/channels/1211482211119796234/1336548894896816222)
d
@Vapi Support Bot @supportr we have set "provider": "vapi" as per recomendation. are you saying to use twilio?
v
Yes, the official documentation recommends using Twilio as the provider for voicemail detection. Update your configuration as follows for best results:
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json
"voicemailDetection": {
  "enabled": true,
  "provider": "twilio"
}
You can also optionally combine this with Vapi's built-in tool for improved accuracy. Effectiveness may still vary by carrier, especially for US T-Mobile numbers. [See documentation](https://docs.vapi.ai/phone-calling/voice-mail-detection) Sources: - [Vapi voicemail detection documentation](https://docs.vapi.ai/phone-calling/voice-mail-detection) - [Discord discussion on Silence Timed Out status and troubleshooting](https://discord.com/channels/1211482211119796234/1336548894896816222)
Based on the documentation and community feedback, it is recommended to use 
"provider": "twilio"
for voicemail detection in Vapi, especially when troubleshooting issues with US T-Mobile numbers. Update your configuration as follows:
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json
"voicemailDetection": {
  "enabled": true,
  "provider": "twilio",
  "machineDetectionSilenceTimeout": 8000
}
This approach is the most supported and documented for your use case. [See documentation](https://docs.vapi.ai/phone-calling/voice-mail-detection) Sources: - [Vapi voicemail detection configuration options](https://docs.vapi.ai/phone-calling/voice-mail-detection) - [Discord: Vapi voicemail detection US T Mobile numbers](https://discord.com/channels/1211482211119796234/1336407849806462976)
d
@Vapi Support Bot we will have all USA carrier and cant built carier specific voice mail settings. Is this always we will use provider as twilio and never vapi?
v
For supporting all USA carriers, the official recommendation is to always use Twilio as your voicemail detection provider in Vapi, since carrier-specific settings are not supported and Twilio is the most documented and reliable option for US numbers. Update your configuration as follows:
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json
"voicemailDetection": {
  "enabled": true,
  "provider": "twilio"
}
You may optionally combine this with Vapi's built-in tool, but Twilio should be your primary provider for US carriers. [See documentation](https://docs.vapi.ai/phone-calling/voice-mail-detection) Sources: - [Vapi voicemail detection documentation](https://docs.vapi.ai/phone-calling/voice-mail-detection) - [Discord: Vapi voicemail detection US T Mobile numbers](https://discord.com/channels/1211482211119796234/1336407849806462976)
You should always use 
"provider": "twilio"
for voicemail detection in Vapi when supporting all US carriers, as carrier-specific settings are not supported and "twilio" is the only documented and recommended provider for this use case. Here’s the recommended configuration:
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json
"voicemailDetection": {
  "enabled": true,
  "provider": "twilio"
}
There is no documentation supporting the use of 
"provider": "vapi"
for US carriers. [See documentation](https://docs.vapi.ai/phone-calling/voice-mail-detection) Sources: - [Vapi voicemail detection documentation](https://docs.vapi.ai/phone-calling/voice-mail-detection) - [Discord: Vapi voicemail detection US T Mobile numbers](https://discord.com/channels/1211482211119796234/1336407849806462976)
a
Hey, Could you please schedule a brief call at your convenience so we can discuss this matter in detail? Kindly use the following link to book a suitable time: .
a
@Shubham Bajaj - I am curious if this is the same issue I am having.
a
This ticket has been marked as solved, and as a result, you will no longer receive any further responses. Kindly create a new support ticket to escalate your inquiry. 
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