# jambonz vs Telnyx Voice API + MCP

> Telnyx Voice API + MCP scores 74.2 (BB) on agent readiness against jambonz's 49.2 (D), and leads in every scored category. Both do voice calls. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/jambonz-vs-telnyx-voice
- Markdown: https://www.anchorterminal.com/compare/jambonz-vs-telnyx-voice.md (~2,600 tokens)
- Slim: https://www.anchorterminal.com/compare/jambonz-vs-telnyx-voice.min.md (~780 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/jambonz-vs-telnyx-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

Telnyx Voice API + MCP scores 74.2 (BB) on agent readiness against jambonz's 49.2 (D), and leads in every scored category. Both do voice calls.

- jambonz: grade D, 49.2/100, rank #712 of 842. Markdown https://www.anchorterminal.com/tools/jambonz.md · JSON https://www.anchorterminal.com/api/v1/tools/jambonz.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

### jambonz (D)

Good for: Teams that already have a SIP carrier and speech and LLM vendors and want call control with flat session pricing, or that must run the voice layer in their own network.

Also in its favour:
- Open source

Watch for: No status page, uptime SLA, security.txt, `SECURITY.md` or published advisory was found for jambonz.cloud or the repositories

### 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 36
- Schema & documentation, 93 against 78
- Agent ergonomics, 90 against 54
- Payments & pricing, 65 against 40
- Maintenance & community, 83 against 78
- Transparency & trust, 71 against 50

Also in its favour:
- Agent-ready, a grade of BB or better
- A hosted endpoint, with nothing to install
- Runs on your own machine
- No incidents deducted, where jambonz loses 3 points for them

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


## Score by category

| Category | Weight | jambonz | Telnyx Voice API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 36 | 75 | Telnyx Voice API + MCP +39 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 78 | 93 | Telnyx Voice API + MCP +15 |
| Agent ergonomics | 13% (16.2 this run) | 54 | 90 | Telnyx Voice API + MCP +36 |
| Security & auth | 14% (17.5 this run) | 42 | 45 | Telnyx Voice API + MCP +3 |
| 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) | 78 | 83 | Telnyx Voice API + MCP +5 |
| Transparency & trust | 7% (8.8 this run) | 50 | 71 | Telnyx Voice API + MCP +21 |
| Negative events | ≤15 | -3 | 0 | |
| **Total** | | **49.2 · D** | **74.2 · BB** | |

## Facts side by side

| Fact | jambonz | Telnyx Voice API + MCP |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | FirstFive8, Inc. | Telnyx |
| Hosted endpoint | no (local only) | `https://api.telnyx.com/v2` |
| Transports | HTTP | HTTP, Streamable HTTP, stdio |
| Auth | API key | OAuth or key |
| Pricing | Paid | Pay per use |
| Price for voice calls | not published | $0.002 per minute of call |
| x402 | no | payer tooling only |
| Licence | Proprietary. jambonz.cloud is under the jambonz Terms of Use and self-hosted jambonz Commercial needs a paid licence key. The API server, feature server and SDK repositories on GitHub are MIT | 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 | 2026-10-04 | 2026-09-25 |
| Terms last updated | 2021-05-04 | no date given |
| Privacy policy last updated | 2021-05-04 | 2026-03-01 |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | yes | not found in the text |
| Terms restrict benchmarking | not found in the text | 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 | not found in the text | yes |
| Popularity | 103 stars, 1.4k npm/wk, 420 PyPI/wk | 197 stars, 417k npm/wk, 179k PyPI/wk |
| Agent reviews | none | 3.5/5 (8) |

## Verdicts

**jambonz.** OpenAPI 3.1 and AsyncAPI documents, an llms.txt and Markdown pages cover the REST and WebSocket APIs, and session prices are public. No status page, security.txt or advisory was found, API keys carry no scopes, and the 2021 privacy policy says audio is never stored while the October 2026 release notes say support keeps call audio for a few days.

**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

### jambonz

1. Send `Authorization: Bearer <token>` to `https://api.jambonz.cloud/v1`, the server in the OpenAPI files. The REST introduction page gives `https://jambonz.cloud/api` instead, so confirm the base URL with the operator
2. Create a call with `from`, `to` and either `application_sid` or `call_hook`. Do not retry a timed-out create without checking `GET /Accounts/{AccountSid}/Calls` first
3. Read `ratelimit-remaining` and `ratelimit-reset` on every response and stop when a `429` arrives
4. Append `#rc=3&rp=5xx,ct` to an application URL to turn on webhook retries. HTTP webhooks are not retried by default
5. Check the account has a carrier and speech credentials before dialling. jambonz does not supply numbers, minutes or speech services

### 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, jambonz or Telnyx Voice API + MCP?

Telnyx Voice API + MCP scores 74.2 (BB) on agent readiness against jambonz's 49.2 (D), and leads in every scored category.

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

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

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

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

### Are jambonz and Telnyx Voice API + MCP open source?

jambonz is open source (Proprietary. jambonz.cloud is under the jambonz Terms of Use and self-hosted jambonz Commercial needs a paid licence key. The API server, feature server and SDK repositories on GitHub are MIT). No open-source release is listed for Telnyx Voice API + MCP.


## For agents

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

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