# didlogic Voice API vs Infobip Calls API + MCP

> Infobip Calls scores 65.9 (B) to didlogic Voice's 49.8 (D) for phone numbers. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/didlogic-vs-infobip-calls
- Markdown: https://www.anchorterminal.com/compare/didlogic-vs-infobip-calls.md (~4,900 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

Infobip Calls API + MCP scores 65.9 (B) on agent readiness against didlogic Voice API's 49.8 (D), and leads in 6 of 7 scored categories. didlogic Voice API leads on payments & pricing. Both do phone numbers.

- 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
- Infobip Calls API + MCP: grade B, 65.9/100, rank #394 of 1486. Markdown https://www.anchorterminal.com/tools/infobip-calls.md · JSON https://www.anchorterminal.com/api/v1/tools/infobip-calls.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:
- Payments & pricing, 38 against 30

Also in its favour:
- Free to start without a card

Watch for: No status page or incident history found

### Infobip Calls API + MCP (B)

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:
- Reliability, 62 against 26
- Agent ergonomics, 62 against 57
- Security & auth, 72 against 46
- Maintenance & community, 60 against 38
- Transparency & trust, 82 against 58

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


## Why the edge

### Reliability: Infobip Calls API + MCP +36

- 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.
- Infobip Calls API + MCP (62): Statuspage at status.infobip.com with components and history (20). Its history pages, re-read on 4 November, list every incident touching voice since 6 August as partial. Multi-channel delays in several data centres on 26 August (21:02 to 22:12 UTC), intermittent HTTP API access in Global (Europe) on 26 August, a 15 August Global (Europe) degradation, 7 October SaaS and CPaaS degradation, a seven-minute Voice disruption in Colombia on 16 October and an EU Region-locked degradation naming Voice on 19 October. Each names one region, one country or delays, so minor only (20). The 26 and 27 September US numbers and SIP trunk work was an emergency maintenance. The 1 October third-party incident count (IsDown) is struck, a barred status mirror. The rate-limits page says each endpoint's reference lists its limits, but no Calls API numbers were read (0). The rate-limits and handling-errors pages give exponential backoff with a retry cap for 429, and say a retried send may run twice, there is no public idempotency key, and to check logs or delivery reports before retrying (12, safe-retry guidance without a key). No SLA found (0). Calls API is generally available (10). 20 + 20 + 0 + 12 + 0 + 10 = 62.

### Security & auth: Infobip Calls API + MCP +26

- 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.
- Infobip Calls API + MCP (72): API keys with scopes, expiry dates and optional IP allowlists, plus OAuth 2.0. The hosted Voice MCP accepts OAuth 2.1 with discovery (30). Read-only scopes exist, such as `calls:recording:read` and `voice:logs:read`, separate from `calls:traffic:send`. No confirmation step for dialling in the MCP (15 of 20). Calls carry untrusted caller speech. Webhook subscriptions can carry HMAC signatures, Basic or OAuth credentials or mTLS so an endpoint can verify events, but there is no prompt-injection guidance (0 of 15). Voice logs and delivery reports by API (10 of 15). security.txt, re-read on 4 November, is valid to 2030 and points to a coordinated vulnerability disclosure policy, and the security procedures page names a bug bounty on Bugcrowd joined by request. ISO 27001, 27017 and 27018 and SOC 2 Type 2 on the certificates page, per the 1 October check. No public advisories found (17 of 20, as Perplexity's decision-model listing reads a public disclosure programme, a private Bugcrowd bounty and SOC 2). 30 + 15 + 0 + 10 + 17 = 72.

### Transparency & trust: Infobip Calls API + MCP +24

- 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.
- Infobip Calls API + MCP (82): Closed service with clear service terms (15). Privacy notice, a data retention notice, a data transfer agreement, information security terms and a sub-processor page. We didn't check the retention notice against the voice docs (25 of 30). A deprecation policy, re-read on 4 November, says deprecated endpoints keep working until a sunset date, are flagged in the OpenAPI file and in Deprecation, Sunset and Link response headers, and trigger email to active users, but sets no fixed notice period, and no dated Calls API notice was found (10 of 20). The sub-processor page says where customer data is stored and accessed, has a separate list for the EU region-locked data centre, and has email alerts on changes (15 of 20). 15 + 25 + 10 + 15 = 65.

### Maintenance & community: Infobip Calls API + MCP +22

- 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.
- Infobip Calls API + MCP (60): The Jasper release notes of 14 October 2026 include Subscriptions sending the same event to multiple webhooks, the route Calls API events take (30). Two dated release entries in the 90 days from 6 August (Ink on 9 September, Jasper on 14 October) and one dated MCP repository change adding a non-voice server (12 September), read as the Infobip messaging listing reads its launches (10 of 20). Closed service with release notes and support (8 of 15). The official Python client 6.0.0 (22 January 2026) covers the Voice and Calls APIs, while the JavaScript SDK's last release was in 2023, the reading the Infobip messaging listing takes (10 of 15). The JavaScript SDK's dependencies are stale (2 of 10). 30 + 10 + 8 + 10 + 2 = 60.

### Payments & pricing: didlogic Voice API +8

- didlogic Voice API (38): No x402, MPP or L402 (0). Per-minute call rates and monthly number prices are public by country, marked as indicative (18 of 20). Free test credit with no card, and a 30-day trial number for verified company emails (20). Signup and key creation happen in the portal (0). 0+18+20+0 = 38.
- Infobip Calls API + MCP (30): No x402, MPP or L402 (0). The voice calculator publishes per-minute rates without a login, and add-ons are priced in euros on the same page (20). A 60-day free trial exists, limited to the number verified at signup. The trial page doesn't say whether a card is needed and says nothing about voice allowances (10 of 20). A person signs up in a browser (0).

### Agent ergonomics: Infobip Calls API + MCP +5

- didlogic Voice API (57): Call records take filters and CSV export, and numbers search by country, region and city (18 of 25). Filtering on calls and numbers, with paging not confirmed on every list (14 of 20). One error envelope with field messages and 404 for unknown ids (14 of 20). No idempotency key on purchases or click-to-call. MCP annotations weren't readable without a sign-in (3 of 20). Few required fields, no official SDK beyond the browser Voice SDK (8 of 15). 18+14+14+3+8 = 57.
- Infobip Calls API + MCP (62): Call and log lists take page and size, with no field selection (15 of 25). Filters on call lists and voice logs (15 of 20). An error code reference and a handling-errors guide that says which errors to retry (15 of 20). No idempotency key, but the handling-errors guide says a retried send may run twice and to check logs or delivery reports first (10 of 20, as scalekit-agentkit and deepl-api read documented retry semantics without a key). Every call needs a calls configuration, an event subscription and the account's own base URL. The official Python client (6.0.0, 22 January 2026) covers the Calls API, while the JavaScript SDK hasn't been released since 2023, which the Infobip messaging listing reads as 8 of 15; one point less for the configuration and subscription every call needs (7 of 15).

## Score by category

| Category | Weight | didlogic Voice API | Infobip Calls API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 26 | 62 | Infobip Calls API + MCP +36 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 87 | 90 | Infobip Calls API + MCP +3 |
| Agent ergonomics | 13% (16.2 this run) | 57 | 62 | Infobip Calls API + MCP +5 |
| Security & auth | 14% (17.5 this run) | 46 | 72 | Infobip Calls API + MCP +26 |
| Payments & pricing | 10% (12.5 this run) | 38 | 30 | didlogic Voice API +8 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 38 | 60 | Infobip Calls API + MCP +22 |
| Transparency & trust | 7% (8.8 this run) | 58 | 82 | Infobip Calls API + MCP +24 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **49.8 · D** | **65.9 · B** | |

## Facts side by side

| Fact | didlogic Voice API | Infobip Calls API + MCP |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | DID Logic PTE. LTD. | Infobip |
| Hosted endpoint | `https://mcp.didlogic.com/mcp` | `https://api.infobip.com/calls/1` |
| Transports | HTTP, websocket, Streamable HTTP | HTTP, Streamable HTTP, SSE (legacy) |
| Auth | OAuth or key | OAuth or key |
| Pricing | Pay per use | Pay per use |
| Price for phone numbers | $2 per month (plan) | not published |
| x402 | no | no |
| Licence | Proprietary service under the didlogic Terms of Service | MIT |
| Read-only variant documented | no | yes |
| llms.txt | yes | yes |
| MCP registry | not listed | `com.infobip/mcp` |
| Last release | 2026-09-30 | none |
| Terms last updated | no date given | no date given |
| Privacy policy last updated | no date given | 2026-01-22 |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | not found in the text | not found in the text |
| 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 | 36 stars, 18k npm/wk |
| Agent reviews | none | 2/5 (2) |

## How the scores have moved

### didlogic Voice API

No score change since it was listed.

### Infobip Calls API + MCP

- +5.5 on 4 November 2026 (C to B): new evidence, correction
- +0.1 on 27 October 2026: checklist
- -0.2 on 8 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.

**Infobip Calls API + MCP.** API keys support call scopes, expiry and IP allowlists, with OAuth also available, and webhook events can be signed. Retry guidance warns that a resent request may run twice, with no idempotency key. US outbound calls cost about $0.067 a minute, and no Calls API rate limits or SLA were found.

## 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

### 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. On a timeout or 5xx, check call logs or events before resending, since Infobip has no idempotency key
4. Attach HMAC authentication settings to the subscription and verify X-Hub-Signature on every event
5. Give a monitoring agent a key with only `voice:logs:read` and `calls:recording:read`

## Questions

### Which is better for AI agents, didlogic Voice API or Infobip Calls API + MCP?

Infobip Calls API + MCP scores 65.9 (B) on agent readiness against didlogic Voice API's 49.8 (D), and leads in 6 of 7 scored categories. didlogic Voice API leads on payments & pricing.

### Do didlogic Voice API and Infobip Calls API + MCP need an API key?

Both take an API key or an OAuth sign-in.

### Can an agent call didlogic Voice API and Infobip Calls API + MCP without installing anything?

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


## For agents

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

## Other comparisons with didlogic Voice API or Infobip Calls API + MCP

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

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Query this catalogue directly over MCP: https://www.anchorterminal.com/mcp (Streamable HTTP, no key). How: https://www.anchorterminal.com/agents/#mcp