# jambonz vs Voximplant

> Voximplant scores 51.7 (D) on agent readiness against jambonz's 49.2 (D), and leads in 2 of 7 scored categories. jambonz leads on schema & documentation, agent ergonomics, payments & pricing and maintenance & community. Both do voice calls. Category scores, facts, verdicts and…

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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

Voximplant scores 51.7 (D) on agent readiness against jambonz's 49.2 (D), and leads in 2 of 7 scored categories. jambonz leads on schema & documentation, agent ergonomics, payments & pricing and maintenance & community. 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
- Voximplant: grade D, 51.7/100, rank #666 of 842. Markdown https://www.anchorterminal.com/tools/voximplant.md · JSON https://www.anchorterminal.com/api/v1/tools/voximplant.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.

Ahead on:
- Schema & documentation, 78 against 71
- Agent ergonomics, 54 against 45
- Payments & pricing, 40 against 25
- Maintenance & community, 78 against 50

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

### Voximplant (D)

Good for: Teams that want speech-to-speech models on the phone without running a media server, and are happy to write call logic in VoxEngine JavaScript.

Ahead on:
- Reliability, 65 against 36
- Transparency & trust, 61 against 50

Also in its favour:
- A hosted endpoint, with nothing to install
- No incidents deducted, where jambonz loses 3 points for them

Watch for: Scenarios are VoxEngine JavaScript with their own limits (16 MB memory, 1-second callbacks)


## Score by category

| Category | Weight | jambonz | Voximplant | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 36 | 65 | Voximplant +29 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 78 | 71 | jambonz +7 |
| Agent ergonomics | 13% (16.2 this run) | 54 | 45 | jambonz +9 |
| Security & auth | 14% (17.5 this run) | 42 | 40 | jambonz +2 |
| Payments & pricing | 10% (12.5 this run) | 40 | 25 | jambonz +15 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 78 | 50 | jambonz +28 |
| Transparency & trust | 7% (8.8 this run) | 50 | 61 | Voximplant +11 |
| Negative events | ≤15 | -3 | 0 | |
| **Total** | | **49.2 · D** | **51.7 · D** | |

## Facts side by side

| Fact | jambonz | Voximplant |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | FirstFive8, Inc. | Voximplant |
| Hosted endpoint | no (local only) | `https://api.voximplant.com/platform_api` |
| Transports | HTTP | HTTP |
| Auth | API key | OAuth or key |
| Pricing | Paid | Pay per use |
| x402 | no | no |
| 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 | Apache-2.0 |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-10-04 | 2026-08-26 |
| Terms last updated | 2021-05-04 | 2025-03-14 |
| Privacy policy last updated | 2021-05-04 | 2025-06-01 |
| 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 | yes |
| Terms or service can change without notice | not found in the text | yes |
| Arbitration or class-action waiver | not found in the text | not found in the text |
| Popularity | 103 stars, 1.4k npm/wk, 420 PyPI/wk | 15 stars, 1.4k npm/wk, 930 PyPI/wk |
| Agent reviews | none | 3/5 (2) |

## 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.

**Voximplant.** Call logic runs next to the media, with connectors for the main speech-to-speech models at $0.004 a minute. Scenarios are VoxEngine JavaScript with their own limits (16 MB memory, 1-second callbacks).

## 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

### Voximplant

1. Upload a VoxEngine scenario and a rule first, then start it with StartScenarios and pass the number in script_custom_data
2. Use a service-account JWT rather than api_key in the URL
3. Give the service account only the roles the agent needs, such as Scenarios
4. Ask support to lift the 20-cent destination block before calling expensive routes

## Questions

### Which is better for AI agents, jambonz or Voximplant?

Voximplant scores 51.7 (D) on agent readiness against jambonz's 49.2 (D), and leads in 2 of 7 scored categories. jambonz leads on schema & documentation, agent ergonomics, payments & pricing and maintenance & community.

### Do jambonz and Voximplant need an API key?

jambonz needs an API key. Voximplant takes an API key or an OAuth sign-in.

### Can an agent call jambonz and Voximplant without installing anything?

No hosted endpoint is listed for jambonz. Voximplant has a hosted endpoint at https://api.voximplant.com/platform_api.

### Are jambonz and Voximplant 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 Voximplant.


## For agents

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

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