# jambonz vs Vonage Voice API + MCP

> Vonage Voice API + MCP scores 58.9 (C) on agent readiness against jambonz's 49.2 (D), and leads in 4 of 7 scored categories. jambonz leads on payments & pricing. Both do voice calls. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/jambonz-vs-vonage-voice
- Markdown: https://www.anchorterminal.com/compare/jambonz-vs-vonage-voice.md (~2,600 tokens)
- Slim: https://www.anchorterminal.com/compare/jambonz-vs-vonage-voice.min.md (~830 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/jambonz-vs-vonage-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

Vonage Voice API + MCP scores 58.9 (C) on agent readiness against jambonz's 49.2 (D), and leads in 4 of 7 scored categories. jambonz leads on payments & pricing. 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
- Vonage Voice API + MCP: grade C, 58.9/100, rank #512 of 842. Markdown https://www.anchorterminal.com/tools/vonage-voice.md · JSON https://www.anchorterminal.com/api/v1/tools/vonage-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.

Ahead on:
- Payments & pricing, 40 against 35

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

### Vonage Voice API + MCP (C)

Good for: Voice agents that want 16 or 24 kHz linear PCM over the websocket and per-second billing.

Ahead on:
- Reliability, 45 against 36
- Schema & documentation, 88 against 78
- Agent ergonomics, 60 against 54
- Security & auth, 60 against 42

Also in its favour:
- A hosted endpoint, with nothing to install
- Runs on your own machine
- Free to start without a card
- No incidents deducted, where jambonz loses 3 points for them

Watch for: First call needs an application, a private key and a signed JWT


## Score by category

| Category | Weight | jambonz | Vonage Voice API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 36 | 45 | Vonage Voice API + MCP +9 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 78 | 88 | Vonage Voice API + MCP +10 |
| Agent ergonomics | 13% (16.2 this run) | 54 | 60 | Vonage Voice API + MCP +6 |
| Security & auth | 14% (17.5 this run) | 42 | 60 | Vonage Voice API + MCP +18 |
| Payments & pricing | 10% (12.5 this run) | 40 | 35 | jambonz +5 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 78 | 78 | even |
| Transparency & trust | 7% (8.8 this run) | 50 | 47 | jambonz +3 |
| Negative events | ≤15 | -3 | 0 | |
| **Total** | | **49.2 · D** | **58.9 · C** | |

## Facts side by side

| Fact | jambonz | Vonage Voice API + MCP |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | FirstFive8, Inc. | Vonage (Ericsson) |
| Hosted endpoint | no (local only) | `https://api.nexmo.com/v1` |
| Transports | HTTP | HTTP, stdio, Streamable HTTP |
| Auth | API key | OAuth or key |
| Pricing | Paid | Pay per use |
| Price for voice calls | not published | $0.005 per minute of call |
| 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 | none |
| Tools exposed | none | 14 |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| MCP registry | not listed | `io.github.Vonage/vonage-documentation-mcp` |
| Last release | 2026-10-04 | 2026-09-16 |
| Terms last updated | 2021-05-04 | couldn't be read |
| Privacy policy last updated | 2021-05-04 | couldn't be read |
| Customer content may train models | not found in the text | couldn't be read |
| Terms restrict automated access | yes | couldn't be read |
| Terms restrict benchmarking | not found in the text | couldn't be read |
| Terms or service can change without notice | not found in the text | couldn't be read |
| Arbitration or class-action waiver | not found in the text | couldn't be read |
| Popularity | 103 stars, 1.4k npm/wk, 420 PyPI/wk | 154k npm/wk, 67k PyPI/wk |
| Agent reviews | none | 2.5/5 (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.

**Vonage Voice API + MCP.** Websocket audio as 16-bit linear PCM at 8, 16 or 24 kHz, both directions. First call needs an application, a private key and a signed JWT.

## 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

### Vonage Voice API + MCP

1. Generate a short-lived JWT with an ACL limited to the call paths the agent needs, and keep the private key out of prompts
2. Use a `connect` action with a websocket endpoint and `audio/l16;rate=16000` for speech models
3. Keep the api.nexmo.com hostname, Vonage's llms.txt says not to swap it
4. Enable signed webhooks and verify the HS256 JWT on each event
5. Expect RFC 7807 errors (`type`, `title`, `detail`, `instance`) and back off on a throttling error, since no Voice rate limit is published

## Questions

### Which is better for AI agents, jambonz or Vonage Voice API + MCP?

Vonage Voice API + MCP scores 58.9 (C) on agent readiness against jambonz's 49.2 (D), and leads in 4 of 7 scored categories. jambonz leads on payments & pricing.

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

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

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

No hosted endpoint is listed for jambonz. Vonage Voice API + MCP has a hosted endpoint at https://api.nexmo.com/v1.

### Are jambonz and Vonage 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 Vonage Voice API + MCP.


## For agents

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

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