Features, pricing, and fit
Compare ConversationRelay and Copilot Studio Voice on voice capabilities, pricing, and fit.
Compare Twilio ConversationRelay and Copilot Studio Voice for AI phone agents, then match channels, workflows, and deployment models to your call flow.
Programmable Voice component that connects a TwiML ConversationRelay session to an application WebSocket for STT/TTS, language settings, DTMF, and call events.
Developers building their own voice-agent logic while keeping telephony, media handling, and call control in Twilio.
Explore its buying criteria: AI phone agents · Voice AI platforms.
Copilot Studio real-time agents deploy to voice and digital channels with a selectable GPT-Realtime native mode or GPT-5-Chat preview plus Neural TTS.
Microsoft teams that need Copilot Studio topics, tools, knowledge, handoffs, and explicit voice configuration across channels.
Explore its buying criteria: AI phone agents · Contact-center AI · Conversation builders.
Both profiles checked 2026-09-04.
Use the table below to compare each provider’s documented scope.
Before you decide
Twilio ConversationRelay: Usage-based Programmable Voice minutes and phone numbers, plus ConversationRelay per-minute charges; model, provider, and other call features are separate. Copilot Studio Voice: Per-user/month Dynamics 365 Contact Center licensing with Copilot pay-as-you-go credits, plus Azure and telephony costs. Ask both vendors to quote the same expected workload, required channels, and implementation scope. Include required subscriptions and usage charges before comparing the total; the listed starting prices alone may cover different work.
The recorded knowledge and data sources for Twilio ConversationRelay include Not publicly documented. For Copilot Studio Voice, they include Not publicly documented. Ask each provider to demonstrate access for the exact systems you use, with permissions, freshness, and failure behavior. A source missing from this directory is not proof that a provider cannot support it.
Use the same representative calls, approved instructions, and escalation rules in both pilots. How does it handle interruption and uncertainty? Which actions can it complete, and which require approval? What context reaches a human during transfer? Record conversation quality, completed tasks, human handoffs, and total cost in the buyer worksheet. Check these specific cautions before launch: Twilio ConversationRelay: Not a packaged agent. Region, carrier, recording, compliance, model, and application responsibilities remain with the implementer. Copilot Studio Voice: Product names, licenses, previews, and architecture vary. Require a bill of materials for Copilot, Dynamics, Azure, telephony, and services.
Record your requirements and pilot results in the buyer worksheet →
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| Criterion | ConversationRelay | Copilot Studio Voice |
|---|---|---|
| Provider type | Telephony voice-agent runtime | Enterprise agent builder and contact-center AI |
| Best fit | Developers building their own voice-agent logic while keeping telephony, media handling, and call control in Twilio. | Microsoft teams that need Copilot Studio topics, tools, knowledge, handoffs, and explicit voice configuration across channels. |
| Key capabilities | phone audio streaming; speech interface; interruptions; WebSocket protocol; TwiML controls | visual authoring; native or cascaded voice; Power Platform actions; knowledge; handoff; governance |
| Team sizes | startup; mid-market; enterprise; developer | mid-market; enterprise; contact centers; developer |
| Call surfaces | phone / PSTN; WebSocket | voice channels; Dynamics 365 Contact Center; digital channels |
| Voice stack | Cascaded speech interface with developer-supplied LLM | Native GPT-Realtime mode or cascaded GPT-5-Chat mode |
| Telephony | Twilio Programmable Voice; phone numbers; SIP | Dynamics 365 Contact Center and Azure integration paths |
| Call controls | Not publicly documented | Not publicly documented |
| Languages | Not publicly documented | Not publicly documented |
| Integrations | Not publicly documented | Not publicly documented |
| Knowledge and data | Not publicly documented | Not publicly documented |
| Pricing model | Usage-based Programmable Voice minutes and phone numbers, plus ConversationRelay per-minute charges; model, provider, and other call features are separate. | Per-user/month Dynamics 365 Contact Center licensing with Copilot pay-as-you-go credits, plus Azure and telephony costs. |
| Pricing signal | ConversationRelay $0.07/min; US local outbound $0.014, inbound $0.0085, SIP $0.004, number $1.15/month. | Dynamics Voice $95/user/month, Contact Center $110, Premium $195, plus Azure/Copilot and telephony. |
| Free plan or trial | Not publicly documented | Not publicly documented |
| What stands out | ConversationRelay handles the live call’s STT/TTS and session transport, then sends prompts, audio-control events, and optional DTMF over a required secure WebSocket to the application. | Microsoft exposes a deliberate runtime choice: GPT-Realtime uses native speech-to-speech, whereas GPT-5-Chat preview uses text reasoning with Neural TTS; voice settings also offer server or semantic VAD. |
| Considerations | Not a packaged agent. Region, carrier, recording, compliance, model, and application responsibilities remain with the implementer. | Product names, licenses, previews, and architecture vary. Require a bill of materials for Copilot, Dynamics, Azure, telephony, and services. |
Developers building their own voice-agent logic while keeping telephony, media handling, and call control in Twilio.
ConversationRelay handles the live call’s STT/TTS and session transport, then sends prompts, audio-control events, and optional DTMF over a required secure WebSocket to the application.
Microsoft teams that need Copilot Studio topics, tools, knowledge, handoffs, and explicit voice configuration across channels.
Microsoft exposes a deliberate runtime choice: GPT-Realtime uses native speech-to-speech, whereas GPT-5-Chat preview uses text reasoning with Neural TTS; voice settings also offer server or semantic VAD.
Verify current pricing, limits, security, and required integrations directly with each provider before purchasing.
Test recognition, speech quality, interruptions, language switching, tool use, and human transfer with your own calls in the required language. Availability can vary by model, plan, and phone route.
DocsBot documents multilingual voice workflows and Japanese support. Verify the exact voice, phone path, and transfer behavior in your pilot. Review DocsBot language information ↗
Other providers’ language claims reflect cited vendor material; confirm Japanese and other required languages directly with each provider.
Listing does not imply endorsement or a performance guarantee. This directory is published by DocsBot. Editorial policy
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