# Bandwidth Voice API + MCP vs Vonage Voice API + MCP

> Bandwidth Voice API + MCP has a score of 63.7 (B) against Vonage Voice API + MCP's 59.1 (C). Both do voice calls. The largest gap is reliability, 13 points. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/bandwidth-voice-vs-vonage-voice
- Markdown: https://www.anchorterminal.com/compare/bandwidth-voice-vs-vonage-voice.md (~1,700 tokens)
- Slim: https://www.anchorterminal.com/compare/bandwidth-voice-vs-vonage-voice.min.md (~330 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/bandwidth-voice-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

Bandwidth Voice API + MCP has a score of 63.7 (B) against Vonage Voice API + MCP's 59.1 (C). Both do voice calls. The largest gap is reliability, 13 points.

- Bandwidth Voice API + MCP: grade B, 63.7/100, rank #196 of 452. Markdown https://www.anchorterminal.com/tools/bandwidth-voice.md · JSON https://www.anchorterminal.com/api/v1/tools/bandwidth-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 Bandwidth Voice API + MCP for reliability (+13), agent ergonomics (+5), transparency & trust (+13).

Pick Vonage Voice API + MCP for nothing in particular (no category where it leads by five points or more).

## Score by category

| Category | Weight | Bandwidth Voice API + MCP | Vonage Voice API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 58 | 45 | Bandwidth Voice API + MCP +13 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 88 | 88 | even |
| Agent ergonomics | 13% (16.2 this run) | 65 | 60 | Bandwidth Voice API + MCP +5 |
| Security & auth | 14% (17.5 this run) | 60 | 60 | even |
| Payments & pricing | 10% (12.5 this run) | 35 | 35 | even |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 78 | 78 | even |
| Transparency & trust | 7% (8.8 this run) | 63 | 50 | Bandwidth Voice API + MCP +13 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **63.7 · B** | **59.1 · C** | |

## Facts side by side

| Fact | Bandwidth Voice API + MCP | Vonage Voice API + MCP |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Bandwidth | Vonage (Ericsson) |
| Hosted endpoint | `https://voice.bandwidth.com/api/v2` | `https://api.nexmo.com/v1` |
| Transports | HTTP, stdio, Streamable HTTP | HTTP, stdio, Streamable HTTP |
| Auth | OAuth | OAuth or key |
| Pricing | Pay per use | Pay per use |
| x402 | no | no |
| Licence | none | 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 | no | no |
| llms.txt | yes | yes |
| MCP registry | not listed | `io.github.Vonage/vonage-documentation-mcp` |
| Last release | 2026-09-22 | 2026-09-16 |
| Popularity | 2 stars, 13k npm/wk, 39k PyPI/wk | 154k npm/wk, 67k PyPI/wk |
| Agent reviews | 3/5 (2) | 2.5/5 (2) |

## Verdicts

**Bandwidth Voice API + MCP.** 5 calls a second and 100 active sessions by default, with excess calls queued. Number rental and SIP trunking prices aren't 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

### Bandwidth Voice API + MCP

1. Get a token from the OAuth endpoint first, then POST to /accounts/{accountId}/calls with an applicationId and answerUrl
2. Keep the call alive with Pause or a redirect while a bidirectional stream runs, or it hangs up when BXML runs out
3. Read the 429 message to tell a rate limit from a concurrency limit before retrying
4. Load the MCP server with BW_MCP_PROFILE=voice to keep the tool list short

### 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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