Head to head · Phone calls · October 2026 research run

didlogic Voice API vs 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. Both do phone calls.

Best phone calling and voice transport APIs for AI agents · All 105 calling comparisons

Which one, for what

didlogic Voice API D

Best 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

Best 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

Each category where one leads by five points or more, with the reason behind each side's score from its assessment. The numbers are in the table below; this is what they stand for.

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

CategoryWeight this rundidlogic Voice APIjambonzEdge
Reliability16%202638jambonz +12
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28753didlogic Voice API +34
Agent ergonomics13%16.25754didlogic Voice API +3
Security & auth14%17.54640didlogic Voice API +6
Payments & pricing10%12.53840jambonz +2
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.83878jambonz +40
Transparency & trust7%8.85852didlogic Voice API +6
Negative events≤150-3
TotalD 49.8/100E 45.4/100

Facts side by side

Factdidlogic Voice APIjambonz
KindHTTP APIHTTP API
VendorDID Logic PTE. LTD.FirstFive8, Inc.
Hosted endpointhttps://mcp.didlogic.com/mcpno (local only)
TransportsHTTP, websocket, Streamable HTTPHTTP
AuthOAuth or keyAPI key
PricingPay per usePaid
Price for phone calls$0.0175 per minute of callnot published
x402nono
LicenceProprietary service under the didlogic Terms of ServiceProprietary. 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 documentednono
llms.txtyesyes
Last release2026-09-302026-10-29
Terms last updatedno date given2021-05-04
Privacy policy last updatedno date given2021-05-04
Customer content may train modelsnot found in the textnot found in the text
Terms restrict automated accessnot found in the textyes
Terms restrict benchmarkingnot found in the textnot found in the text
Terms or service can change without noticenot found in the textnot found in the text
Arbitration or class-action waiveryesnot found in the text
Popularitynone103 stars, 1.4k npm/wk

How the scores have moved

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).

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