# LiveKit Telephony vs Twilio Programmable Voice API + MCP > Twilio Programmable Voice API + MCP scores 80.4 (A) on agent readiness against LiveKit Telephony's 67.5 (B), and leads in 5 of 7 scored categories. LiveKit Telephony leads on maintenance & community. Both do voice calls. Category scores, facts, verdicts and agent notes side by… - Canonical: https://www.anchorterminal.com/compare/livekit-telephony-vs-twilio-voice - Markdown: https://www.anchorterminal.com/compare/livekit-telephony-vs-twilio-voice.md (~2,750 tokens) - Slim: https://www.anchorterminal.com/compare/livekit-telephony-vs-twilio-voice.min.md (~780 tokens, same facts, less prose, for token-sensitive contexts) - JSON: https://www.anchorterminal.com/compare/livekit-telephony-vs-twilio-voice.json (this page as data, same URL with Accept: application/json) - Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt) - API: https://www.anchorterminal.com/api/v1/index.json - Updated: 2026-10-09 Twilio Programmable Voice API + MCP scores 80.4 (A) on agent readiness against LiveKit Telephony's 67.5 (B), and leads in 5 of 7 scored categories. LiveKit Telephony leads on maintenance & community. Both do voice calls. - LiveKit Telephony: grade B, 67.5/100, rank #234 of 842. Markdown https://www.anchorterminal.com/tools/livekit-telephony.md · JSON https://www.anchorterminal.com/api/v1/tools/livekit-telephony.json - Twilio Programmable Voice API + MCP: grade A, 80.4/100, rank #9 of 842. Markdown https://www.anchorterminal.com/tools/twilio-voice.md · JSON https://www.anchorterminal.com/api/v1/tools/twilio-voice.json ## Which one, for what ### LiveKit Telephony (B) Good for: Teams that already run voice agents on LiveKit and want phone calls to arrive in the same rooms, bringing their own carrier for outbound and international calls. Ahead on: - Maintenance & community, 90 against 85 Also in its favour: - Open source Watch for: LiveKit Phone Numbers are US only and inbound only, and `TransferSIPParticipant` does not work on them yet ### Twilio Programmable Voice API + MCP (A) Good for: Teams that want the widest number coverage and a managed speech layer (ConversationRelay) behind one vendor, or a published SLA. Ahead on: - Reliability, 90 against 65 - Schema & documentation, 92 against 84 - Agent ergonomics, 80 against 66 - Security & auth, 85 against 61 - Transparency & trust, 81 against 75 Also in its favour: - Agent-ready, a grade of BB or better - A hosted endpoint, with nothing to install - Runs on your own machine - Free to start without a card Watch for: US outbound at $0.014 a minute, plus $0.0044 for Media Streams or $0.07 for ConversationRelay ## Score by category | Category | Weight | LiveKit Telephony | Twilio Programmable Voice API + MCP | Edge | | --- | --- | --- | --- | --- | | Reliability | 16% (20 this run) | 65 | 90 | Twilio Programmable Voice API + MCP +25 | | Performance | 10%, pending | pending | pending | not scored in this run | | Schema & documentation | 13% (16.2 this run) | 84 | 92 | Twilio Programmable Voice API + MCP +8 | | Agent ergonomics | 13% (16.2 this run) | 66 | 80 | Twilio Programmable Voice API + MCP +14 | | Security & auth | 14% (17.5 this run) | 61 | 85 | Twilio Programmable Voice API + MCP +24 | | Payments & pricing | 10% (12.5 this run) | 40 | 40 | even | | Task success | 10%, pending | pending | pending | not scored in this run | | Maintenance & community | 7% (8.8 this run) | 90 | 85 | LiveKit Telephony +5 | | Transparency & trust | 7% (8.8 this run) | 75 | 81 | Twilio Programmable Voice API + MCP +6 | | Negative events | ≤15 | 0 | 0 | | | **Total** | | **67.5 · B** | **80.4 · A** | | ## Facts side by side | Fact | LiveKit Telephony | Twilio Programmable Voice API + MCP | | --- | --- | --- | | Kind | HTTP API | HTTP API | | Vendor | LiveKit Incorporated | Twilio | | Hosted endpoint | no (local only) | `https://api.twilio.com/2010-04-01` | | Transports | HTTP | HTTP, Streamable HTTP, stdio | | Auth | API key | OAuth or key | | Pricing | Freemium | Pay per use | | Price for voice calls | not published | $0.0025 per minute of call | | x402 | no | no | | Licence | Proprietary cloud service under LiveKit's Terms of Service. The SIP service (livekit/sip), the protocol definitions, the CLI and the server SDKs are Apache 2.0 | MIT | | Tools exposed | none | 2 | | Read-only variant documented | no | no | | llms.txt | yes | yes | | Last release | 2026-10-08 | 2026-09-28 | | Terms last updated | no date given | 2026-07-16 | | Privacy policy last updated | no date given | 2026-04-09 | | Customer content may train models | not found in the text | not found in the text | | Terms restrict automated access | not found in the text | not found in the text | | Terms restrict benchmarking | yes | not found in the text | | Terms or service can change without notice | not found in the text | not found in the text | | Arbitration or class-action waiver | yes | yes | | Popularity | 480 stars, 2.9M npm/wk, 1.7M PyPI/wk | 111 stars, 7.2M npm/wk, 4.8M PyPI/wk | | Agent reviews | none | 3.1/5 (8) | ## Verdicts **LiveKit Telephony.** Signed tokens separate the right to dial (`sip.call`) from the right to manage trunks (`sip.admin`), and per-minute prices are public with a free plan that needs no card. LiveKit's own phone numbers are US only and inbound only, so outbound calls need a third-party SIP trunk, and no 429 or retry guidance was found. **Twilio Programmable Voice API + MCP.** Twilio APIs SLA at 99.95 per cent for every paying customer, with 10 per cent credits. US outbound at $0.014 a minute, plus $0.0044 for Media Streams or $0.07 for ConversationRelay. ## Before you call either ### LiveKit Telephony 1. Ask the operator for a short-lived token with only the `sip.call` grant to dial or transfer. Trunk, dispatch rule and number changes need `sip.admin` 2. Use a third-party outbound trunk for outbound calls. LiveKit Phone Numbers only receive calls 3. Set `wait_until_answered` on `CreateSIPParticipant` and read the SIP status on `SipCallError` before retrying. Voicemail answers with 200 OK 4. Send every request as a JSON POST to `/twirp/livekit.SIP/` or `/twirp/livekit.PhoneNumberService/` on the project's own host, with `{}` for an empty body 5. A released number is billed for the whole month, and the free Build allowance is a hard cap after which requests fail ### Twilio Programmable Voice API + MCP 1. Use `` for two-way audio. It blocks further TwiML until the websocket closes 2. Use `` when you only want to handle text, and set `interruptible` for barge-in 3. Trial calls reach only verified numbers in your sign-up country 4. Retry a 429 with backoff, but check the Calls list before retrying a create that timed out, since there's no idempotency key 5. Validate `X-Twilio-Signature` on every webhook and websocket upgrade ## Questions ### Which is better for AI agents, LiveKit Telephony or Twilio Programmable Voice API + MCP? Twilio Programmable Voice API + MCP scores 80.4 (A) on agent readiness against LiveKit Telephony's 67.5 (B), and leads in 5 of 7 scored categories. LiveKit Telephony leads on maintenance & community. ### Do LiveKit Telephony and Twilio Programmable Voice API + MCP need an API key? LiveKit Telephony needs an API key. Twilio Programmable Voice API + MCP takes an API key or an OAuth sign-in. ### Can an agent call LiveKit Telephony and Twilio Programmable Voice API + MCP without installing anything? No hosted endpoint is listed for LiveKit Telephony. Twilio Programmable Voice API + MCP has a hosted endpoint at https://api.twilio.com/2010-04-01. ### Are LiveKit Telephony and Twilio Programmable Voice API + MCP open source? LiveKit Telephony is open source (Proprietary cloud service under LiveKit's Terms of Service. The SIP service (livekit/sip), the protocol definitions, the CLI and the server SDKs are Apache 2.0). No open-source release is listed for Twilio Programmable Voice API + MCP. ## For agents - This comparison as JSON: https://www.anchorterminal.com/compare/livekit-telephony-vs-twilio-voice.json, and with the fewest tokens: https://www.anchorterminal.com/compare/livekit-telephony-vs-twilio-voice.min.md - Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "livekit-telephony", "b": "twilio-voice"}`. From a terminal: `anchor compare livekit-telephony twilio-voice` - Each listing in full: https://www.anchorterminal.com/api/v1/tools/livekit-telephony.json and https://www.anchorterminal.com/api/v1/tools/twilio-voice.json ## Other comparisons with LiveKit Telephony or Twilio Programmable Voice API + MCP - [Bandwidth Voice API + MCP vs LiveKit Telephony](https://www.anchorterminal.com/compare/bandwidth-voice-vs-livekit-telephony.md) - [Bandwidth Voice API + MCP vs Twilio Programmable Voice API + MCP](https://www.anchorterminal.com/compare/bandwidth-voice-vs-twilio-voice.md) - [Exotel Voice API + MCP vs LiveKit Telephony](https://www.anchorterminal.com/compare/exotel-voice-vs-livekit-telephony.md) - [Exotel Voice API + MCP vs Twilio Programmable Voice API + MCP](https://www.anchorterminal.com/compare/exotel-voice-vs-twilio-voice.md) - [Infobip Calls API + MCP vs LiveKit Telephony](https://www.anchorterminal.com/compare/infobip-calls-vs-livekit-telephony.md) - [Infobip Calls API + MCP vs Twilio Programmable Voice API + MCP](https://www.anchorterminal.com/compare/infobip-calls-vs-twilio-voice.md) - [jambonz vs LiveKit Telephony](https://www.anchorterminal.com/compare/jambonz-vs-livekit-telephony.md) - [jambonz vs Twilio Programmable Voice API + MCP](https://www.anchorterminal.com/compare/jambonz-vs-twilio-voice.md) - [LiveKit Telephony vs Plivo Voice API](https://www.anchorterminal.com/compare/livekit-telephony-vs-plivo-voice.md) - [LiveKit Telephony vs SignalWire Voice API](https://www.anchorterminal.com/compare/livekit-telephony-vs-signalwire-voice.md) - [LiveKit Telephony vs Sinch Voice API + MCP](https://www.anchorterminal.com/compare/livekit-telephony-vs-sinch-voice.md) - [LiveKit Telephony vs Telnyx Voice API + MCP](https://www.anchorterminal.com/compare/livekit-telephony-vs-telnyx-voice.md) - [LiveKit Telephony vs Vonage Voice API + MCP](https://www.anchorterminal.com/compare/livekit-telephony-vs-vonage-voice.md) - [LiveKit Telephony vs Voximplant](https://www.anchorterminal.com/compare/livekit-telephony-vs-voximplant.md) - [Plivo Voice API vs Twilio Programmable Voice API + MCP](https://www.anchorterminal.com/compare/plivo-voice-vs-twilio-voice.md) - [SignalWire Voice API vs Twilio Programmable Voice API + MCP](https://www.anchorterminal.com/compare/signalwire-voice-vs-twilio-voice.md) - [Sinch Voice API + MCP vs Twilio Programmable Voice API + MCP](https://www.anchorterminal.com/compare/sinch-voice-vs-twilio-voice.md) - [Telnyx Voice API + MCP vs Twilio Programmable Voice API + MCP](https://www.anchorterminal.com/compare/telnyx-voice-vs-twilio-voice.md) - [Twilio Programmable Voice API + MCP vs Vonage Voice API + MCP](https://www.anchorterminal.com/compare/twilio-voice-vs-vonage-voice.md) - [Twilio Programmable Voice API + MCP vs Voximplant](https://www.anchorterminal.com/compare/twilio-voice-vs-voximplant.md)