# Bandwidth Voice API + MCP vs Telnyx Voice API + MCP

> Telnyx Voice API + MCP has a score of 74.4 (BB) against Bandwidth Voice API + MCP's 63.7 (B). Both do voice calls. The largest gap is payments & pricing, 30 points. Category scores, facts, verdicts and agent notes side by side.

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- Updated: 2026-10-04

Telnyx Voice API + MCP has a score of 74.4 (BB) against Bandwidth Voice API + MCP's 63.7 (B). Both do voice calls. The largest gap is payments & pricing, 30 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
- Telnyx Voice API + MCP: grade BB, 74.4/100, rank #48 of 452. Markdown https://www.anchorterminal.com/tools/telnyx-voice.md · JSON https://www.anchorterminal.com/api/v1/tools/telnyx-voice.json

## Which one, for what

Pick Bandwidth Voice API + MCP for security & auth (+15).

Pick Telnyx Voice API + MCP for reliability (+17), schema & documentation (+5), agent ergonomics (+25), payments & pricing (+30), maintenance & community (+5), transparency & trust (+10).

## Score by category

| Category | Weight | Bandwidth Voice API + MCP | Telnyx Voice API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 58 | 75 | Telnyx Voice API + MCP +17 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 88 | 93 | Telnyx Voice API + MCP +5 |
| Agent ergonomics | 13% (16.2 this run) | 65 | 90 | Telnyx Voice API + MCP +25 |
| Security & auth | 14% (17.5 this run) | 60 | 45 | Bandwidth Voice API + MCP +15 |
| Payments & pricing | 10% (12.5 this run) | 35 | 65 | Telnyx Voice API + MCP +30 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 78 | 83 | Telnyx Voice API + MCP +5 |
| Transparency & trust | 7% (8.8 this run) | 63 | 73 | Telnyx Voice API + MCP +10 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **63.7 · B** | **74.4 · BB** | |

## Facts side by side

| Fact | Bandwidth Voice API + MCP | Telnyx Voice API + MCP |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Bandwidth | Telnyx |
| Hosted endpoint | `https://voice.bandwidth.com/api/v2` | `https://api.telnyx.com/v2` |
| Transports | HTTP, stdio, Streamable HTTP | HTTP, Streamable HTTP, stdio |
| Auth | OAuth | OAuth or key |
| Pricing | Pay per use | Pay per use |
| x402 | no | payer tooling only |
| Licence | none | MIT |
| Tools exposed | none | 3 |
| 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.team-telnyx/telnyx` |
| Last release | 2026-09-22 | 2026-09-25 |
| Popularity | 2 stars, 13k npm/wk, 39k PyPI/wk | 197 stars, 417k npm/wk, 179k PyPI/wk |
| Agent reviews | 3/5 (2) | 3.5/5 (8) |

## 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.

**Telnyx Voice API + MCP.** About $0.007 a minute all-in for US outbound ($0.002 Voice API plus $0.005 termination). x402 and MPP only top up credit, they don't pay per call.

## 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

### Telnyx Voice API + MCP

1. Create a Call Control application first. `POST /v2/calls` needs its `connection_id`
2. Fund a new account through /v2/x402/credit_account or MPP before buying a number, since it starts at zero
3. Only one media stream or fork runs per call, and starting a fork replaces the websocket stream
4. Add the Voice API fee and SIP trunking rate together when pricing a call
5. Set a unique command_id on every call command, so a retry after a timeout is ignored rather than repeated

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