# DIDWW Voice and Number Management API vs jambonz

> DIDWW Voice and Number Management scores 65.1 (B) to jambonz's 49.2 (D) for sip trunking. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-jambonz
- Markdown: https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-jambonz.md (~3,100 tokens)
- Slim: https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-jambonz.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-jambonz.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

DIDWW Voice and Number Management API scores 65.1 (B) on agent readiness against jambonz's 49.2 (D), and leads in 6 of 7 scored categories. jambonz leads on payments & pricing. Both do sip trunking.

- DIDWW Voice and Number Management API: grade B, 65.1/100, rank #330 of 950. Markdown https://www.anchorterminal.com/tools/didww-voice-and-number-management.md · JSON https://www.anchorterminal.com/api/v1/tools/didww-voice-and-number-management.json
- jambonz: grade D, 49.2/100, rank #800 of 950. Markdown https://www.anchorterminal.com/tools/jambonz.md · JSON https://www.anchorterminal.com/api/v1/tools/jambonz.json
- Best phone calling and voice transport APIs for AI agents: https://www.anchorterminal.com/best/voice-calling/index.md
- All 78 calling comparisons: https://www.anchorterminal.com/compare/voice-calling/index.md

## Which one, for what

### DIDWW Voice and Number Management API (B)

Good for: Teams that run their own SIP system, or a voice agent platform that accepts SIP trunks, and need numbers in many countries with compliance records handled through an API.

Ahead on:
- Reliability, 66 against 36
- Schema & documentation, 87 against 78
- Agent ergonomics, 77 against 54
- Security & auth, 57 against 42
- Maintenance & community, 83 against 78
- Transparency & trust, 70 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: No per-number or per-minute price is published. Price lists are sent on request or shown inside an account, and a $30 balance is needed before ordering

### 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 15

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


## Score by category

| Category | Weight | DIDWW Voice and Number Management API | jambonz | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 66 | 36 | DIDWW Voice and Number Management API +30 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 87 | 78 | DIDWW Voice and Number Management API +9 |
| Agent ergonomics | 13% (16.2 this run) | 77 | 54 | DIDWW Voice and Number Management API +23 |
| Security & auth | 14% (17.5 this run) | 57 | 42 | DIDWW Voice and Number Management API +15 |
| Payments & pricing | 10% (12.5 this run) | 15 | 40 | jambonz +25 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 83 | 78 | DIDWW Voice and Number Management API +5 |
| Transparency & trust | 7% (8.8 this run) | 70 | 50 | DIDWW Voice and Number Management API +20 |
| Negative events | ≤15 | 0 | -3 | |
| **Total** | | **65.1 · B** | **49.2 · D** | |

## Facts side by side

| Fact | DIDWW Voice and Number Management API | jambonz |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | DIDWW Ireland Limited | FirstFive8, Inc. |
| Hosted endpoint | `https://api.didww.com/mcp` | no (local only) |
| Transports | HTTP | HTTP |
| Auth | API key | API key |
| Pricing | Pay per use | Paid |
| x402 | no | no |
| Licence | Proprietary service under the DIDWW Terms and Agreements (Rev 3.1). The OpenAPI repository and the official SDKs are MIT | 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 |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-10-07 | 2026-10-04 |
| Terms last updated | no date given | 2021-05-04 |
| Privacy policy last updated | no date given | 2021-05-04 |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | not found in the text | yes |
| 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 | not found in the text |
| Popularity | 10 stars, 462 npm/wk | 103 stars, 1.4k npm/wk, 420 PyPI/wk |

## Verdicts

**DIDWW Voice and Number Management API.** An OpenAPI 3.0.3 document with 107 operations, Markdown docs, a free sandbox and SDKs in seven languages cover number ordering and SIP trunk set-up. No per-number or per-minute price is public, API keys carry no scopes, orders have no idempotency key, and outbound calling needs an approved application. Calls travel over SIP only.

**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.

## Before you call either

### DIDWW Voice and Number Management API

1. Send `Api-Key: <key>` with no `Bearer` prefix, plus `Accept: application/vnd.api+json`, and `Content-Type: application/vnd.api+json` on every request with a body
2. Set `X-DIDWW-API-Version: 2026-04-16` on each request and read `meta.api_version` in the reply. A header older than the account's version is ignored
3. Before retrying a timed-out `POST /orders`, list `GET /orders` first. The order is charged to the balance at once and no idempotency key exists
4. Stay under 20 requests a second per key. On `429` wait before retrying, since no `Retry-After` header is documented
5. Use `fields[...]`, `filter[...]`, `include` and `page[size]` (default 50, maximum 100) to keep JSON:API replies small
6. Check `GET /address_requirements` before buying a number. Many countries need a verified identity and address, and the sandbox cannot run identity verification
7. Create and enable a callback secret in the User Panel before relying on callbacks. Without one nothing is sent, and receivers must verify `X-DIDWW-Signature`

### 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

## Questions

### Which is better for AI agents, DIDWW Voice and Number Management API or jambonz?

DIDWW Voice and Number Management API scores 65.1 (B) on agent readiness against jambonz's 49.2 (D), and leads in 6 of 7 scored categories. jambonz leads on payments & pricing.

### Do DIDWW Voice and Number Management API and jambonz need an API key?

Both need an API key.

### Can an agent call DIDWW Voice and Number Management API and jambonz without installing anything?

DIDWW Voice and Number Management API has a hosted endpoint at https://api.didww.com/mcp. No hosted endpoint is listed for jambonz.

### Are DIDWW Voice and Number Management API and jambonz open source?

No open-source release is listed for DIDWW Voice and Number Management API. 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).


## For agents

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

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