Telnyx Voice AI Agents vs Twilio ConversationRelay

For a no-code agency deploying and reselling voice AI, the ability to build agents without code is essential. Telnyx Voice AI Agents explicitly includes a no-code agent builder, while no such capability is confirmed for Twilio ConversationRelay. On production cost, which directly affects agency margins, Telnyx runs $0.056-$0.061 per minute versus Twilio at $0.079-$0.084 per minute, a meaningful gap that compounds across high call volumes. Telnyx also charges $0 per month as a platform fee, so agencies can onboard clients without fixed overhead eating into resale margins. Native outbound campaigns are confirmed for Telnyx, enabling agencies to offer proactive calling products without custom engineering. Twilio ConversationRelay is a developer-oriented WebSocket framework requiring code integration by design, making it a poor fit for no-code agency workflows.

For engineering teams building custom pipelines, the ability to plug in your own LLM and drive every lifecycle step through an API are the deciding factors. Both Telnyx Voice AI Agents and Twilio ConversationRelay support bring-your-own LLMBYO LLM - Bring your own language model - use an OpenAI, Anthropic, or self-hosted endpoint instead of the platform default. and are fully API-first, so those criteria cancel out. The tiebreakers become latency, bring-your-own TTS, and testing tooling. On latency, Telnyx claims 200 ms end-to-end versus Twilio's 491 ms median, a meaningful difference for conversational responsiveness. Telnyx also offers a verified bring-your-own TTS voice capability and a simulation and testing suite, neither of which is confirmed for Twilio ConversationRelay. Native SIP trunking is a draw. These advantages across latency, TTS flexibility, and built-in testing push Telnyx ahead for teams who want tight, low-latency control over every layer of the pipeline.

For ecommerce support and order flows, the breadth of native integrations is the deciding factor. Telnyx Voice AI Agents offers 30+ prebuilt integrations including Zapier, MCP, and webhooks, making it straightforward to connect to ecommerce platforms, CRMs, and order management systems out of the box. Twilio ConversationRelay connects via WebSocket to any LLM and lists Deepgram and ElevenLabs as integrations, but this is a developer-facing connectivity model rather than a library of prebuilt ecommerce-relevant connectors. Telnyx also includes a built-in knowledge base, which is critical for product FAQs and order status scripts, while no equivalent is documented for Twilio ConversationRelay. Both tools offer self-serve signup and DTMFDTMF - Touch-tone keypad input - the tones when a caller presses 1-9. navigation. Telnyx carries a $0/mo platform fee, keeping costs low for merchants scaling seasonally.

For HIPAAHIPAA BAA - A signed Business Associate Agreement that lets you handle protected health information under US healthcare privacy law.-bound healthcare workflows, the single most critical requirement is a HIPAA BAA that does not cost extra. Telnyx Voice AI Agents includes a HIPAA BAA on its base plan, while Twilio ConversationRelay treats it as a paid add-on. That difference alone is decisive for compliance-driven buyers who cannot afford gaps in their Business Associate Agreement coverage. Both platforms hold SOC 2 Type II certification and both support GDPR tooling, so those factors do not separate them. Telnyx also offers warm transfer to human agents, which matters for healthcare escalation workflows. Beyond compliance, Telnyx carries a lower base rate of $0.05/min versus $0.07/min for Twilio ConversationRelay, and estimated real production costs of $0.056-$0.061/min for Telnyx versus $0.079-$0.084/min for Twilio ConversationRelay, meaning healthcare teams save money while staying compliant.

For outbound sales campaigns, native outbound campaign functionality is the deciding factor. Telnyx Voice AI Agents explicitly includes it, while Twilio ConversationRelay has no verified equivalent. On cost, Telnyx runs $0.056-$0.061 per minute versus Twilio's $0.079-$0.084 per minute, a meaningful savings at scale. Telnyx also supports 500 concurrent calls on its base plan, which is critical for high-volume dialing. Both platforms offer native SIP trunkingSIP trunking - Direct phone-network connectivity that lets the platform place and receive calls without a separate carrier in the middle. and warm transfer to human agents. The combination of dedicated campaign tooling, lower per-minute cost, and high base concurrency makes the choice straightforward.

For an SMB running a receptionist and booking service, keeping overhead low is critical. Telnyx Voice AI Agents charges $0 per month in platform fees, while Twilio ConversationRelay has no published equivalent $0 option, which matters enormously for budget-conscious small businesses. Beyond cost, Telnyx includes a built-in knowledge base, a no-code agent builder, and warm transferwarm transfer - Handing a live call to a human with context passed along, rather than a cold drop. to human agents out of the box, none of which are confirmed for Twilio ConversationRelay. Both tools support in-platform number provisioning, so that is a wash. The combination of zero platform fee and ready-made SMB-friendly features makes the choice straightforward.