# didlogic Voice API vs jambonz

> didlogic Voice scores 49.8 (D) to jambonz's 45.4 (E) for phone calls. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/didlogic-vs-jambonz
- Markdown: https://www.anchorterminal.com/compare/didlogic-vs-jambonz.md (~4,950 tokens)
- Site index for agents: https://www.anchorterminal.com/llms.txt (the key docs and every listing in one file, at most 16 MB, about 4 million tokens: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- MCP: https://www.anchorterminal.com/mcp (the whole catalogue as tools, no key)
- DNS: dig +short TXT <slug>.grade.anchorterminal.com (the grade as a DNS TXT record, for a sandbox with no HTTP where names still resolve; also top., best.<category>. and <a>.vs.<b>. under the zone, and the same under grade.letme.dev)
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)
- Updated: 2026-11-07

didlogic Voice API scores 49.8 (D) on agent readiness against jambonz's 45.4 (E), and leads in 4 of 7 scored categories. jambonz leads on reliability and maintenance & community. Both do phone calls.

- didlogic Voice API: grade D, 49.8/100, rank #1074 of 1486. Markdown https://www.anchorterminal.com/tools/didlogic.md · JSON https://www.anchorterminal.com/api/v1/tools/didlogic.json
- jambonz: grade E, 45.4/100, rank #1180 of 1486. 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 105 calling comparisons: https://www.anchorterminal.com/compare/voice-calling/index.md

## Which one, for what

### didlogic Voice API (D)

Good for: Teams that need numbers and SIP termination in many countries and a WebSocket bridge to a voice agent.

Ahead on:
- Schema & documentation, 87 against 53
- Security & auth, 46 against 40
- Transparency & trust, 58 against 52

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

Watch for: No status page or incident history found

### jambonz (E)

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:
- Reliability, 38 against 26
- Maintenance & community, 78 against 38

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


## Why the edge

### Maintenance & community: jambonz +40

- didlogic Voice API (38): Release notes dated by month, the newest September 2026 (click-to-call API and WebSocket calls), about 37 to 67 days before this check (20). Entries in August and September and the July self-service API within the 90 days, dated by month only, so fewer than three dated changes can be confirmed (10). Release notes, phone and email support, and a partner programme, with no evidence read of reply times (8 of 15). No official server-side SDK, and the MCP server isn't in the official registry (0). No package to assess (0). 20+10+8+0+0 = 38.
- jambonz (78): Releases read from depth-200 clones on 4 November. `@jambonz/sdk` was tagged v0.11.0 on 24 October, v0.12.0 on 27 October and v0.12.1 on 29 October, `jambonz-python-sdk` v0.4.0 on 24 October, and jambonz-api-server and jambonz-feature-server v0.9.15 on 23 October (30). From 6 August that is at least five tags across the listed packages and servers, with the 11.1.5 and 11.1.6 release notes of 24 September and 4 October per the 8 October check (20). Of the 30 newest open issues and pull requests on jambonz-feature-server, 10 had a comment per the 8 October check. GitHub's pages were not re-read (10 of 25). The Node.js SDK is current and the Python SDK is still marked Alpha (12 of 15). The API server runs lint and tests in CI on every push and pull request. We did not see the latest run's result (6 of 10). 30 + 20 + 10 + 12 + 6 = 78.

### Schema & documentation: didlogic Voice API +34

- didlogic Voice API (87): Public OpenAPI 3.0.3 file with 53 operations (25). llms.txt and Markdown pages (10). Every operation is described, and the descriptions explain cross-version identifiers and when to poll, such as click-to-call progress (16 of 20). Typed request bodies with required fields and enums in the spec (12 of 15). Examples, a standard error envelope (`{"errors":{"base":[...]}}`) and 401, 403, 404 and 422 responses on most operations (12 of 15). Paths versioned v1 and v2, and release notes dated by month (12 of 15). 25+10+16+12+12+12 = 87.
- jambonz (53): Per the 8 October check, not re-read on 4 November under the terms pause. OpenAPI 3.1 files and an AsyncAPI 2.6.0 file on docs.jambonz.org were read on 8 October, but no page read then or since was recorded as linking them as visible downloads, and the docs host is now paused, so they aren't counted as a published contract (0). llms.txt, per-section indexes and every page as Markdown (10). The verb pages explain use at length. Operation descriptions in the API reference are mostly one line (12 of 20). Enums for call status, direction and mid-call actions and required fields are marked in the reference. `to`, `call_hook`, `tag` and `amd` are objects, a partial held (11 of 15). The SDK and verb pages carry code examples. Errors are a single `msg` string, a partial held (8 of 15). The Node.js SDK adds `/v1` to the base URL it is given, and the changelog is dated with component version tables (12 of 15). 0 + 10 + 12 + 11 + 8 + 12 = 53.

### Reliability: jambonz +12

- didlogic Voice API (26): Graded on the hosted API and MCP server with the hosted lines. The footer's network status page carries no components or incidents, and no other status page was found (0). No readable incident history (5). Rate limits are given only for recording lookups (one a second, one lookup a minute) (5 of 15). Those endpoints document 429 with Retry-After and X-RateLimit headers, with no backoff guidance or idempotency elsewhere, including number purchases and click-to-call (6 of 15). The site claims 99.999 per cent voice uptime, but no SLA was found in the Terms (0). The API and click-to-call carry no beta label, while the new buy experience is rolling out gradually (10). 0+5+5+6+0+10 = 26.
- jambonz (38): Graded as a hosted service, the API on jambonz.cloud, which the docs name as the simplest way to start. jambonz's Terms of Use (updated 13 October 2026) bar automated software that crawls or indexes any page of the website, so jambonz pages are per the 8 October check, not re-read on 4 November under the terms pause. No status page is linked from jambonz.org, the docs or the jambonz.cloud landing page (0), so there is no readable incident history (5). Rate limits are published with numbers, 600 requests per 5 minute fixed window per client IP address on the docs page, while the 11.1.6 notes of 4 October 2026 give 4,000 call creations and 600 call status reads a minute per account, a disagreement held as a partial (13 of 15). The API server's code sets `standardHeaders` on its limiter, so responses carry `RateLimit-*` headers including the reset, and a client over a limit receives 429. No backoff guidance or idempotency key was found for the REST API (10 of 15). No uptime SLA was found for jambonz.cloud. Support SLAs are sold only with Enterprise support for self-hosted systems (0). The REST and WebSocket APIs carry no beta label (10). 0 + 5 + 13 + 10 + 0 + 10 = 38.

### Security & auth: didlogic Voice API +6

- didlogic Voice API (46): Revocable bearer keys created in the portal, each with full account access by the vendor's own warning. MCP OAuth mints a separate key per sign-in (18 of 30). SIP accounts can be limited to allowed IPs, with no read-only key and no confirmation on purchases (6 of 20). Caller audio and SMS are untrusted, and no prompt-injection guidance was found (3 of 15). Call detail records, transaction history and risk-check logs through the API, with no audit log of API calls (7 of 15). ISO/IEC 27001:2022 and ISO 9001 certificates from TÜV AUSTRIA Hellas with registration numbers. No security.txt or bug bounty found (12 of 20). 18+6+3+7+12 = 46.
- jambonz (40): Docs readings are per the 8 October check, not re-read on 4 November under the terms pause. Bearer API tokens belong to an account or a service provider and carry `expires_at` and `last_used` fields. They can be created by API. No scopes and no delete operation appear in the published reference (18 of 30). No read-only key and no confirmation step before dialling were found. Call capacity limits can be set per account (4 of 20). Calls carry untrusted caller speech into the `agent` and `llm` verbs. The docs cover webhook signing with `Jambonz-Signature` and basic authentication, and no prompt-injection guidance was found in the pages read (5 of 15). Recent calls expose SIP traces, pcap files and Jaeger traces, and alerts can be pushed to a webhook, Slack, PagerDuty or email since 11.1.6. No log of API or portal actions was found (9 of 15). No security.txt, disclosure policy, bug bounty or certification was found. No `SECURITY.md` is in the API server, feature server, Node.js or Python SDK repositories (4 November clones), and osv.dev lists no advisory for jambonz. The 11.1.5 notes describe fixes from a security review, held as a partial (4 of 20). 18 + 4 + 5 + 9 + 4 = 40.

### Transparency & trust: didlogic Voice API +6

- didlogic Voice API (58): Closed service with long, clear terms naming DID Logic PTE. LTD. in Singapore (15 of 30). The privacy policy commits to data minimisation and says call content isn't monitored except for requested recording, but gives no retention periods (12 of 30). No deprecation policy, though the docs explain backward-compatible identifier changes (5 of 20). Twelve points of presence are claimed, with no sub-processor list or data locations found (5 of 20). 15+12+5+5 = 37.
- jambonz (52): Per the 8 October check for the privacy policy and docs, not re-read on 4 November under the terms pause. The API server, feature server and SDKs are public under MIT. The product on jambonz.cloud and in the self-hosted packages is jambonz Commercial, which needs a licence key and whose terms forbid modifying its proprietary portions, while the docs still call jambonz open source (20 of 30). The privacy policy is dated 4 May 2021. It gives 30 days for usage data and an opt-out for call detail records. It says audio is never stored on jambonz servers, and the 11.1.6 notes of 4 October 2026 say support keeps SIP and RTP from calls for a few days, with an opt-out added in that release. No DPA was found (10 of 30). No deprecation policy was found. Removals are announced in the release that makes them, such as SMPP and five speech vendors in July and August 2026 (6 of 20). No sub-processor list was found. The policy says servers are in the United States and names a third-party billing partner. Telemetry from self-hosted instances is listed field by field (7 of 20). 20 + 10 + 6 + 7 = 43.

## Score by category

| Category | Weight | didlogic Voice API | jambonz | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 26 | 38 | jambonz +12 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 87 | 53 | didlogic Voice API +34 |
| Agent ergonomics | 13% (16.2 this run) | 57 | 54 | didlogic Voice API +3 |
| Security & auth | 14% (17.5 this run) | 46 | 40 | didlogic Voice API +6 |
| Payments & pricing | 10% (12.5 this run) | 38 | 40 | jambonz +2 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 38 | 78 | jambonz +40 |
| Transparency & trust | 7% (8.8 this run) | 58 | 52 | didlogic Voice API +6 |
| Negative events | ≤15 | 0 | -3 | |
| **Total** | | **49.8 · D** | **45.4 · E** | |

## Facts side by side

| Fact | didlogic Voice API | jambonz |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | DID Logic PTE. LTD. | FirstFive8, Inc. |
| Hosted endpoint | `https://mcp.didlogic.com/mcp` | no (local only) |
| Transports | HTTP, websocket, Streamable HTTP | HTTP |
| Auth | OAuth or key | API key |
| Pricing | Pay per use | Paid |
| Price for phone calls | $0.0175 per minute of call | not published |
| x402 | no | no |
| Licence | Proprietary service under the didlogic Terms of Service | 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 | 2026-09-30 | 2026-10-29 |
| 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 | yes | not found in the text |
| Popularity | none | 103 stars, 1.4k npm/wk |

## How the scores have moved

### didlogic Voice API

No score change since it was listed.

### jambonz

- -4.0 on 4 November 2026 (D to E): correction
- -0.1 on 28 October 2026: correction
- +0.3 on 27 October 2026: checklist

## Verdicts

**didlogic Voice API.** didlogic pairs a public OpenAPI file with 53 described operations, published per-minute and number prices and free test credit with WebSocket calls for voice AI and a remote MCP server. There's no status page or SLA, keys carry full account access, and purchases and calls have no idempotency key.

**jambonz.** An llms.txt and Markdown pages cover the REST and WebSocket APIs, session prices are public and the SDKs shipped five tags in October 2026. No status page, security.txt or advisory was found, API keys carry no scopes, and server security fixes ship without advisories.

## Before you call either

### didlogic Voice API

1. Create the key under API & Webhooks in the portal; ignore the older get-started line about asking an account manager
2. Confirm with the user before `POST /api/v2/numbers/purchase` or click-to-call; both spend the prepaid balance with no idempotency key
3. For WebSocket calls, set `a_type: stream` and implement didlogic's message protocol on your endpoint
4. Back off on 429 from recording endpoints using Retry-After
5. Expect the MCP server only on the Plus plan

### jambonz

1. Send `Authorization: Bearer <token>`. The REST introduction page gives `https://jambonz.cloud/api` as the base URL and the Node.js SDK adds `/v1` to the base URL it is given, 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, didlogic Voice API or jambonz?

didlogic Voice API scores 49.8 (D) on agent readiness against jambonz's 45.4 (E), and leads in 4 of 7 scored categories. jambonz leads on reliability and maintenance & community.

### Do didlogic Voice API and jambonz need an API key?

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

### Can an agent call didlogic Voice API and jambonz without installing anything?

didlogic Voice API has a hosted endpoint at https://mcp.didlogic.com/mcp. No hosted endpoint is listed for jambonz.

### Are didlogic Voice API and jambonz open source?

No open-source release is listed for didlogic Voice 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/didlogic-vs-jambonz.json, and with the fewest tokens: https://www.anchorterminal.com/compare/didlogic-vs-jambonz.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "didlogic", "b": "jambonz"}`. From a terminal: `anchor compare didlogic jambonz`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/didlogic.json and https://www.anchorterminal.com/api/v1/tools/jambonz.json

## Other comparisons with didlogic Voice API or jambonz

- [46elks Voice API vs didlogic Voice API](https://www.anchorterminal.com/compare/46elks-vs-didlogic.md)
- [46elks Voice API vs jambonz](https://www.anchorterminal.com/compare/46elks-vs-jambonz.md)
- [Bandwidth Voice API + MCP vs didlogic Voice API](https://www.anchorterminal.com/compare/bandwidth-voice-vs-didlogic.md)
- [Bandwidth Voice API + MCP vs jambonz](https://www.anchorterminal.com/compare/bandwidth-voice-vs-jambonz.md)
- [Exotel Voice API + MCP vs jambonz](https://www.anchorterminal.com/compare/exotel-voice-vs-jambonz.md)
- [Infobip Calls API + MCP vs jambonz](https://www.anchorterminal.com/compare/infobip-calls-vs-jambonz.md)
- [jambonz vs LiveKit Telephony](https://www.anchorterminal.com/compare/jambonz-vs-livekit-telephony.md)
- [jambonz vs Plivo Voice API](https://www.anchorterminal.com/compare/jambonz-vs-plivo-voice.md)
- [jambonz vs SignalWire Voice API](https://www.anchorterminal.com/compare/jambonz-vs-signalwire-voice.md)
- [jambonz vs Sinch Voice API + MCP](https://www.anchorterminal.com/compare/jambonz-vs-sinch-voice.md)
- [jambonz vs Telnyx Voice API + MCP](https://www.anchorterminal.com/compare/jambonz-vs-telnyx-voice.md)
- [jambonz vs Twilio Programmable Voice API + MCP](https://www.anchorterminal.com/compare/jambonz-vs-twilio-voice.md)
- [jambonz vs Vonage Voice API + MCP](https://www.anchorterminal.com/compare/jambonz-vs-vonage-voice.md)
- [jambonz vs Voximplant](https://www.anchorterminal.com/compare/jambonz-vs-voximplant.md)
- [didlogic Voice API vs DIDWW Voice and Number Management API](https://www.anchorterminal.com/compare/didlogic-vs-didww-voice-and-number-management.md)
- [didlogic Voice API vs Exotel Voice API + MCP](https://www.anchorterminal.com/compare/didlogic-vs-exotel-voice.md)
- [didlogic Voice API vs Infobip Calls API + MCP](https://www.anchorterminal.com/compare/didlogic-vs-infobip-calls.md)
- [didlogic Voice API vs LiveKit Telephony](https://www.anchorterminal.com/compare/didlogic-vs-livekit-telephony.md)
- [didlogic Voice API vs Plivo Voice API](https://www.anchorterminal.com/compare/didlogic-vs-plivo-voice.md)
- [didlogic Voice API vs SignalWire Voice API](https://www.anchorterminal.com/compare/didlogic-vs-signalwire-voice.md)
- [didlogic Voice API vs Sinch Voice API + MCP](https://www.anchorterminal.com/compare/didlogic-vs-sinch-voice.md)
- [didlogic Voice API vs Telnyx Voice API + MCP](https://www.anchorterminal.com/compare/didlogic-vs-telnyx-voice.md)
- [didlogic Voice API vs Twilio Programmable Voice API + MCP](https://www.anchorterminal.com/compare/didlogic-vs-twilio-voice.md)
- [didlogic Voice API vs Vonage Voice API + MCP](https://www.anchorterminal.com/compare/didlogic-vs-vonage-voice.md)
- [didlogic Voice API vs Voximplant](https://www.anchorterminal.com/compare/didlogic-vs-voximplant.md)
- [DIDWW Voice and Number Management API vs jambonz](https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-jambonz.md)

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