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Head to head · Phone numbers · October 2026 research run

DIDWW Voice and Number Management API vs Infobip Calls API + MCP

DIDWW Voice and Number Management API scores 65.1 (B) on agent readiness against Infobip Calls API + MCP's 60.3 (C), and leads in 3 of 7 scored categories. Infobip Calls API + MCP leads on security & auth, payments & pricing and transparency & trust. Both do phone numbers.

Best phone calling and voice transport APIs for AI agents · All 78 calling comparisons

DIDWW Voice and Number Management APIDIDWW Ireland Limited · HTTP API B65.1/100#330 of 950 Infobip Calls API + MCPInfobip · HTTP API C60.3/100#517 of 950

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 58
  • Agent ergonomics, 77 against 50
  • Maintenance & community, 83 against 48

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

Infobip Calls API + MCP C

Good for Teams already on Infobip messaging, or that need one vendor for PSTN, SIP, WebRTC and WhatsApp calling across many countries with tightly scoped keys.

Ahead on

  • Security & auth, 65 against 57
  • Payments & pricing, 30 against 15
  • Transparency & trust, 76 against 70

Watch for

US outbound at about $0.067 a minute, several times Plivo, SignalWire or Telnyx

Score by category

CategoryWeight this runDIDWW Voice and Number Management APIInfobip Calls API + MCPEdge
Reliability16%206658DIDWW Voice and Number Management API +8
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28790Infobip Calls API + MCP +3
Agent ergonomics13%16.27750DIDWW Voice and Number Management API +27
Security & auth14%17.55765Infobip Calls API + MCP +8
Payments & pricing10%12.51530Infobip Calls API + MCP +15
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.88348DIDWW Voice and Number Management API +35
Transparency & trust7%8.87076Infobip Calls API + MCP +6
Negative events≤1500
Total65.1 · B60.3 · C

Facts side by side

FactDIDWW Voice and Number Management APIInfobip Calls API + MCP
KindHTTP APIHTTP API
VendorDIDWW Ireland LimitedInfobip
Hosted endpointhttps://api.didww.com/mcphttps://api.infobip.com/calls/1
TransportsHTTPHTTP, Streamable HTTP, SSE (legacy)
AuthAPI keyOAuth or key
PricingPay per usePay per use
x402nono
LicenceProprietary service under the DIDWW Terms and Agreements (Rev 3.1). The OpenAPI repository and the official SDKs are MITMIT
Read-only variant documentednoyes
llms.txtyesyes
MCP registrynot listedcom.infobip/mcp
Last release2026-10-07none
Terms last updatedno date givenno date given
Privacy policy last updatedno date given2026-01-22
Customer content may train modelsnot found in the textnot found in the text
Terms restrict automated accessnot found in the textnot found in the text
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 waivernot found in the textnot found in the text
Popularity10 stars, 462 npm/wk36 stars, 18k npm/wk
Agent reviewsnone2/5 (2)

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.

Infobip Calls API + MCP

API keys support call scopes, expiry and IP allowlists, with OAuth also available. US outbound calls cost about $0.067 a minute.

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

Infobip Calls API + MCP

  1. Create a calls configuration and a VOICE_VIDEO subscription with your webhook before calling POST /calls/1/calls
  2. Use your account's own base URL, not api.infobip.com
  3. Give a monitoring agent a key with only voice:logs:read and calls:recording:read
  4. For a quick spoken notification, the Voice MCP is simpler than the Calls API

Questions

Which is better for AI agents, DIDWW Voice and Number Management API or Infobip Calls API + MCP?

DIDWW Voice and Number Management API scores 65.1 (B) on agent readiness against Infobip Calls API + MCP's 60.3 (C), and leads in 3 of 7 scored categories. Infobip Calls API + MCP leads on security & auth, payments & pricing and transparency & trust.

Do DIDWW Voice and Number Management API and Infobip Calls API + MCP need an API key?

DIDWW Voice and Number Management API needs an API key. Infobip Calls API + MCP takes an API key or an OAuth sign-in.

Can an agent call DIDWW Voice and Number Management API and Infobip Calls API + MCP without installing anything?

Yes. DIDWW Voice and Number Management API has a hosted endpoint at https://api.didww.com/mcp and Infobip Calls API + MCP at https://api.infobip.com/calls/1.

Other comparisons with DIDWW Voice and Number Management API or Infobip Calls API + MCP

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