# Exotel Voice API + MCP vs Vonage Voice API + MCP

> Vonage Voice API + MCP has a score of 59.1 (C) against Exotel Voice API + MCP's 39.8 (E). Both do voice calls. The largest gap is maintenance & community, 73 points. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/exotel-voice-vs-vonage-voice
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- Slim: https://www.anchorterminal.com/compare/exotel-voice-vs-vonage-voice.min.md (~380 tokens, same facts, less prose, for token-sensitive contexts)
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- 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

Vonage Voice API + MCP has a score of 59.1 (C) against Exotel Voice API + MCP's 39.8 (E). Both do voice calls. The largest gap is maintenance & community, 73 points.

- Exotel Voice API + MCP: grade E, 39.8/100, rank #424 of 452. Markdown https://www.anchorterminal.com/tools/exotel-voice.md · JSON https://www.anchorterminal.com/api/v1/tools/exotel-voice.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 Exotel Voice API + MCP for reliability (+5), transparency & trust (+13).

Pick Vonage Voice API + MCP for schema & documentation (+40), agent ergonomics (+20), security & auth (+20), payments & pricing (+15), maintenance & community (+73).

## Score by category

| Category | Weight | Exotel Voice API + MCP | Vonage Voice API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 50 | 45 | Exotel Voice API + MCP +5 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 48 | 88 | Vonage Voice API + MCP +40 |
| Agent ergonomics | 13% (16.2 this run) | 40 | 60 | Vonage Voice API + MCP +20 |
| Security & auth | 14% (17.5 this run) | 40 | 60 | Vonage Voice API + MCP +20 |
| Payments & pricing | 10% (12.5 this run) | 20 | 35 | Vonage Voice API + MCP +15 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 5 | 78 | Vonage Voice API + MCP +73 |
| Transparency & trust | 7% (8.8 this run) | 63 | 50 | Exotel Voice API + MCP +13 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **39.8 · E** | **59.1 · C** | |

## Facts side by side

| Fact | Exotel Voice API + MCP | Vonage Voice API + MCP |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Exotel | Vonage (Ericsson) |
| Hosted endpoint | `https://api.exotel.com/v1` | `https://api.nexmo.com/v1` |
| Transports | HTTP, Streamable HTTP | HTTP, stdio, Streamable HTTP |
| Auth | API key | OAuth or key |
| Pricing | Pay per use | Pay per use |
| x402 | no | no |
| Licence | MIT | none |
| Tools exposed | 62 | 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 | no | no |
| llms.txt | no | yes |
| MCP registry | not listed | `io.github.Vonage/vonage-documentation-mcp` |
| Last release | none | 2026-09-16 |
| Popularity | 5 stars | 154k npm/wk, 67k PyPI/wk |
| Agent reviews | 2/5 (2) | 2.5/5 (2) |

## Verdicts

**Exotel Voice API + MCP.** Local Indian numbers and DLT and TRAI handling. Per-minute rates and plan prices not published.

**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

### Exotel Voice API + MCP

1. Use api.in.exotel.com for India-hosted accounts and api.exotel.com for Singapore-hosted ones
2. Pass StreamUrl on Calls/connect for a quick outbound voice-agent call
3. Whitelist test numbers before calling on a trial account
4. Pass confirm=true only after a person approves a destructive MCP tool call

### 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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