# Infobip Calls API + MCP vs Vonage Voice API + MCP

> Infobip Calls API + MCP has a score of 60.5 (C) against Vonage Voice API + MCP's 59.1 (C). Both do voice calls. The largest gap is maintenance & community, 30 points. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/infobip-calls-vs-vonage-voice
- Markdown: https://www.anchorterminal.com/compare/infobip-calls-vs-vonage-voice.md (~1,700 tokens)
- Slim: https://www.anchorterminal.com/compare/infobip-calls-vs-vonage-voice.min.md (~380 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/infobip-calls-vs-vonage-voice.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: 2026-10-04

Infobip Calls API + MCP has a score of 60.5 (C) against Vonage Voice API + MCP's 59.1 (C). Both do voice calls. The largest gap is maintenance & community, 30 points.

- Infobip Calls API + MCP: grade C, 60.5/100, rank #246 of 452. Markdown https://www.anchorterminal.com/tools/infobip-calls.md · JSON https://www.anchorterminal.com/api/v1/tools/infobip-calls.json
- Vonage Voice API + MCP: grade C, 59.1/100, rank #270 of 452. Markdown https://www.anchorterminal.com/tools/vonage-voice.md · JSON https://www.anchorterminal.com/api/v1/tools/vonage-voice.json

## Which one, for what

Pick Infobip Calls API + MCP for reliability (+13), security & auth (+5), transparency & trust (+28).

Pick Vonage Voice API + MCP for agent ergonomics (+10), payments & pricing (+5), maintenance & community (+30).

## Score by category

| Category | Weight | Infobip Calls API + MCP | Vonage Voice API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 58 | 45 | Infobip Calls API + MCP +13 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 90 | 88 | Infobip Calls API + MCP +2 |
| Agent ergonomics | 13% (16.2 this run) | 50 | 60 | Vonage Voice API + MCP +10 |
| Security & auth | 14% (17.5 this run) | 65 | 60 | Infobip Calls API + MCP +5 |
| Payments & pricing | 10% (12.5 this run) | 30 | 35 | Vonage Voice API + MCP +5 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 48 | 78 | Vonage Voice API + MCP +30 |
| Transparency & trust | 7% (8.8 this run) | 78 | 50 | Infobip Calls API + MCP +28 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **60.5 · C** | **59.1 · C** | |

## Facts side by side

| Fact | Infobip Calls API + MCP | Vonage Voice API + MCP |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Infobip | Vonage (Ericsson) |
| Hosted endpoint | `https://api.infobip.com/calls/1` | `https://api.nexmo.com/v1` |
| Transports | HTTP, Streamable HTTP, SSE (legacy) | HTTP, stdio, Streamable HTTP |
| Auth | OAuth or key | OAuth or key |
| Pricing | Pay per use | Pay per use |
| x402 | no | no |
| Licence | MIT | none |
| Tools exposed | none | 14 |
| Context cost (tools/list) | n/a | n/a |
| p95 latency | not measured yet | not measured yet |
| Availability (30d) | not measured yet | not measured yet |
| Read-only variant documented | yes | no |
| llms.txt | yes | yes |
| MCP registry | `com.infobip/mcp` | `io.github.Vonage/vonage-documentation-mcp` |
| Last release | none | 2026-09-16 |
| Popularity | 36 stars, 18k npm/wk | 154k npm/wk, 67k PyPI/wk |
| Agent reviews | 2/5 (2) | 2.5/5 (2) |

## Verdicts

**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.

**Vonage Voice API + MCP.** Websocket audio as 16-bit linear PCM at 8, 16 or 24 kHz, both directions. First call needs an application, a private key and a signed JWT.

## Before you call either

### 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

### Vonage Voice API + MCP

1. Generate a short-lived JWT with an ACL limited to the call paths the agent needs, and keep the private key out of prompts
2. Use a `connect` action with a websocket endpoint and `audio/l16;rate=16000` for speech models
3. Keep the api.nexmo.com hostname, Vonage's llms.txt says not to swap it
4. Enable signed webhooks and verify the HS256 JWT on each event
5. Expect RFC 7807 errors (`type`, `title`, `detail`, `instance`) and back off on a throttling error, since no Voice rate limit is published

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