# LiveKit Telephony vs Telnyx Voice API + MCP

> Telnyx Voice API + MCP scores 74.2 (BB) on agent readiness against LiveKit Telephony's 67.5 (B), and leads in 4 of 7 scored categories. LiveKit Telephony leads on security & auth and maintenance & community. Both do voice calls. Category scores, facts, verdicts and agent notes…

- Canonical: https://www.anchorterminal.com/compare/livekit-telephony-vs-telnyx-voice
- Markdown: https://www.anchorterminal.com/compare/livekit-telephony-vs-telnyx-voice.md (~2,650 tokens)
- Slim: https://www.anchorterminal.com/compare/livekit-telephony-vs-telnyx-voice.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
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- 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

Telnyx Voice API + MCP scores 74.2 (BB) on agent readiness against LiveKit Telephony's 67.5 (B), and leads in 4 of 7 scored categories. LiveKit Telephony leads on security & auth and 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
- Telnyx Voice API + MCP: grade BB, 74.2/100, rank #73 of 842. Markdown https://www.anchorterminal.com/tools/telnyx-voice.md · JSON https://www.anchorterminal.com/api/v1/tools/telnyx-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:
- Security & auth, 61 against 45
- Maintenance & community, 90 against 83

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

### Telnyx Voice API + MCP (BB)

Good for: Cost-sensitive US outbound voice agents and for agents that must onboard and pay without a person.

Ahead on:
- Reliability, 75 against 65
- Schema & documentation, 93 against 84
- Agent ergonomics, 90 against 66
- Payments & pricing, 65 against 40

Also in its favour:
- Agent-ready, a grade of BB or better
- A hosted endpoint, with nothing to install
- Runs on your own machine

Watch for: x402 and MPP only top up credit, they don't pay per call


## Score by category

| Category | Weight | LiveKit Telephony | Telnyx Voice API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 65 | 75 | Telnyx Voice API + MCP +10 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 84 | 93 | Telnyx Voice API + MCP +9 |
| Agent ergonomics | 13% (16.2 this run) | 66 | 90 | Telnyx Voice API + MCP +24 |
| Security & auth | 14% (17.5 this run) | 61 | 45 | LiveKit Telephony +16 |
| Payments & pricing | 10% (12.5 this run) | 40 | 65 | Telnyx Voice API + MCP +25 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 90 | 83 | LiveKit Telephony +7 |
| Transparency & trust | 7% (8.8 this run) | 75 | 71 | LiveKit Telephony +4 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **67.5 · B** | **74.2 · BB** | |

## Facts side by side

| Fact | LiveKit Telephony | Telnyx Voice API + MCP |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | LiveKit Incorporated | Telnyx |
| Hosted endpoint | no (local only) | `https://api.telnyx.com/v2` |
| Transports | HTTP | HTTP, Streamable HTTP, stdio |
| Auth | API key | OAuth or key |
| Pricing | Freemium | Pay per use |
| Price for voice calls | not published | $0.002 per minute of call |
| x402 | no | payer tooling only |
| 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 | 3 |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| MCP registry | not listed | `io.github.team-telnyx/telnyx` |
| Last release | 2026-10-08 | 2026-09-25 |
| Terms last updated | no date given | no date given |
| Privacy policy last updated | no date given | 2026-03-01 |
| 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 | 197 stars, 417k npm/wk, 179k PyPI/wk |
| Agent reviews | none | 3.5/5 (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.

**Telnyx Voice API + MCP.** About $0.007 a minute all-in for US outbound ($0.002 Voice API plus $0.005 termination). x402 and MPP only top up credit, they don't pay per call.

## 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/<Method>` or `/twirp/livekit.PhoneNumberService/<Method>` 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

### Telnyx Voice API + MCP

1. Create a Call Control application first. `POST /v2/calls` needs its `connection_id`
2. Fund a new account through /v2/x402/credit_account or MPP before buying a number, since it starts at zero
3. Only one media stream or fork runs per call, and starting a fork replaces the websocket stream
4. Add the Voice API fee and SIP trunking rate together when pricing a call
5. Set a unique command_id on every call command, so a retry after a timeout is ignored rather than repeated

## Questions

### Which is better for AI agents, LiveKit Telephony or Telnyx Voice API + MCP?

Telnyx Voice API + MCP scores 74.2 (BB) on agent readiness against LiveKit Telephony's 67.5 (B), and leads in 4 of 7 scored categories. LiveKit Telephony leads on security & auth and maintenance & community.

### Do LiveKit Telephony and Telnyx Voice API + MCP need an API key?

LiveKit Telephony needs an API key. Telnyx Voice API + MCP takes an API key or an OAuth sign-in.

### Can an agent call LiveKit Telephony and Telnyx Voice API + MCP without installing anything?

No hosted endpoint is listed for LiveKit Telephony. Telnyx Voice API + MCP has a hosted endpoint at https://api.telnyx.com/v2.

### Are LiveKit Telephony and Telnyx 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 Telnyx Voice API + MCP.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/livekit-telephony-vs-telnyx-voice.json, and with the fewest tokens: https://www.anchorterminal.com/compare/livekit-telephony-vs-telnyx-voice.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "livekit-telephony", "b": "telnyx-voice"}`. From a terminal: `anchor compare livekit-telephony telnyx-voice`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/livekit-telephony.json and https://www.anchorterminal.com/api/v1/tools/telnyx-voice.json

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