CallSync – Business Call Logging & Management for SIM-Based Teams
https://mcp.callsyncapp.com/mcp ↗
Description
# CallSync MCP Server: Connect SIM-Based Call Logs to AI Agents 📞🤖 **[CallSync](https://callsyncapp.com)** is a powerful mobile-first sales CRM and call tracking ecosystem built for modern sales teams. This Model Context Protocol (MCP) server allows AI agents (like Claude Desktop, Cursor, and Windsurf) to securely query call data, manage contacts, and trigger voice-to-text analysis directly from your chat sidebar. --- ## 💡 Why CallSync? Traditional VOIP services fail when sales representatives make real phone calls from their mobile SIMs. CallSync solves this: * **SIM-Based Capture:** Syncs outgoing and incoming mobile call logs, metadata, and audio recordings automatically from our Android App. * **Instant AI Processing:** Automated call transcription, summarization, sentiment classification, and target-intent analysis. * **Unified Sales CRM:** A mobile-friendly dashboard to manage leads, tasks, and follow-ups. --- ## ⚙️ Available AI Tools & Actions Once connected, your AI
What our measurements say
CallSync – Business Call Logging & Management for SIM-Based Teams is a remote MCP server published at mcp.callsyncapp.com. It has been probed 26 times since 9/10/2026. It answered in 26 of them (100.0%), a near-uninterrupted record. Median response time is 422 ms, placing it among the faster endpoints. Its tool list could not be read; the server is closed to direct calls. It answers direct calls with an authentication wall.
Agent readability score
Can an LLM agent pick the right tool here — names, descriptions and parameter clarity are assessed.
Agent readability score
Agent readability score
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| Run | Era | Modern | ms | Legacy | ms | Versions |
|---|---|---|---|---|---|---|
| 2026-09-12 23:31:36 | Auth-gated | 401 | 517 | 401 | 499 | — |
| 2026-09-12 21:29:15 | Auth-gated | 401 | 556 | 401 | 463 | — |
| 2026-09-12 19:27:29 | Auth-gated | 401 | 735 | 401 | 737 | — |
| 2026-09-12 17:24:09 | Auth-gated | 401 | 407 | 401 | 418 | — |
| 2026-09-12 15:21:42 | Auth-gated | 401 | 531 | 401 | 531 | — |
| 2026-09-12 13:29:16 | Auth-gated | 401 | 743 | 401 | 755 | — |
| 2026-09-12 11:39:06 | Auth-gated | 401 | 302 | 401 | 500 | — |
| 2026-09-12 09:47:15 | Auth-gated | 401 | 362 | 401 | 308 | — |
| 2026-09-12 07:55:23 | Auth-gated | 401 | 422 | 401 | 414 | — |
| 2026-09-12 06:04:09 | Auth-gated | 401 | 354 | 401 | 366 | — |
Availability history
Each block is one measurement round. Green: working response. Amber: responded but the server was returning errors (5xx). Red: no response at all.
Era history
Each cell is one probe run. Faded cells are incomplete probes — one leg did not answer, so the era is inconclusive.
Response time history
The two probe legs separately: modern server/discover and legacy initialize.
Event log
Derived by comparing consecutive probes — changes in era, protocol version, build and reachability.
- Added to watch — era: Auth-gated
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