Configure basic voice agents

Publisher

Microsoft

URL

https://learn.microsoft.com/en-us/microsoft-copilot-studio/voice-configuration

Published

2026-07-06

Updated

unknown

Accessed

2026-09-30

HTTP status

200

License

Microsoft Learn; site terms apply; no-redistribution; short excerpts and locators only

Source notes citing this source

• In Copilot Studio basic voice agents, barge-in supports both DTMF-based and voice-based interruption, and Microsoft advises turning it off for a recently updated message, a compliance message that should not be interrupted, and the first agent message. in context
• Microsoft warns that turning off Enable voice on a Copilot Studio agent whose Telephony channel is enabled can break the agent because all DTMF triggers are automatically disabled, and that the change takes effect only when the agent is published. in context
• Microsoft recommends per-question DTMF mapping over a global DTMF-only setting (System.Conversation.OnlyAllowDTMF) in Copilot Studio, because informational messages sent while DTMF-only mode is on can produce an empty DTMF grammar and telephony errors. in context
• Copilot Studio voice agents expose System.Activity.UserInputType, which records whether the caller used DTMF or speech, and System.Activity.SpeechRecognition.Confidence, a value between 0 and 1 from the last speech recognition event. in context
• In Copilot Studio basic voice agents the agent-level silence detection timeout defaults to No silence timeout, meaning the agent waits indefinitely for input, and the default fallback action after silence reprompts on a Question node is Hang up, with Escalate available as an alternative. in context
• Copilot Studio basic voice agent defaults are: DTMF interdigit timeout 3,000 ms, DTMF termination timeout 2,000 ms, utterance end timeout 1,500 ms (values above 3,000 ms are reduced to 3,000 ms), and speech recognition timeout 12,000 ms. in context
• Copilot Studio basic voice agents support blind transfer to a PSTN phone number and to a direct routing number; an optional SIP UUI header sends only its first 256 characters, and transfers carrying SIP UUI must use direct routing because PSTN numbers do not support SIP UUI header transfers. in context

Cite this source record

APA

WarmTransfer. (2026, July 6). Configure basic voice agents. WarmTransfer. https://warmtransfer.net/knowledge/sources/ms-learn-copilot-studio-voice-config

BibTeX

@misc{warmtransfer-ms-learn-copilot-studio-voice-config,
  title  = {Configure basic voice agents},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/sources/ms-learn-copilot-studio-voice-config},
  note   = {Microsoft, accessed 2026-09-30}
}