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Head to head · Voice calls · October 2026 research run

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.

LiveKit TelephonyLiveKit Incorporated · HTTP API B67.5/100#234 of 841 Telnyx Voice API + MCPTelnyx · HTTP API BB74.2/100#73 of 841

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

CategoryWeight this runLiveKit TelephonyTelnyx Voice API + MCPEdge
Reliability16%206575Telnyx Voice API + MCP +10
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28493Telnyx Voice API + MCP +9
Agent ergonomics13%16.26690Telnyx Voice API + MCP +24
Security & auth14%17.56145LiveKit Telephony +16
Payments & pricing10%12.54065Telnyx Voice API + MCP +25
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.89083LiveKit Telephony +7
Transparency & trust7%8.87571LiveKit Telephony +4
Negative events≤1500
Total67.5 · B74.2 · BB

Facts side by side

FactLiveKit TelephonyTelnyx Voice API + MCP
KindHTTP APIHTTP API
VendorLiveKit IncorporatedTelnyx
Hosted endpointno (local only)https://api.telnyx.com/v2
TransportsHTTPHTTP, Streamable HTTP, stdio
AuthAPI keyOAuth or key
PricingFreemiumPay per use
Price for voice callsnot published$0.002 per minute of call
x402nopayer tooling only
LicenceProprietary cloud service under LiveKit's Terms of Service. The SIP service (livekit/sip), the protocol definitions, the CLI and the server SDKs are Apache 2.0MIT
Tools exposednone3
Read-only variant documentednono
llms.txtyesyes
MCP registrynot listedio.github.team-telnyx/telnyx
Last release2026-10-082026-09-25
Terms last updatedno date givenno date given
Privacy policy last updatedno date given2026-03-01
Customer content may train modelsnot found in the textnot found in the text
Terms restrict automated accessnot found in the textnot found in the text
Terms restrict benchmarkingyesnot found in the text
Terms or service can change without noticenot found in the textnot found in the text
Arbitration or class-action waiveryesyes
Popularity480 stars, 2.9M npm/wk, 1.7M PyPI/wk197 stars, 417k npm/wk, 179k PyPI/wk
Agent reviewsnone3.5/5 (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.

Other comparisons with LiveKit Telephony or Telnyx Voice API + MCP

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