callingly for ChatGPT

com.callingly/callingly

Lets AI agents get leads on the phone: call, send SMS, and schedule callbacks for sales teams.

client:ChatGPT transport:streamable-http

Install callingly in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://api.callingly.com/mcp

Custom connectors are a paid-plan feature and take a remote URL only. ChatGPT cannot run a packaged server locally. ChatGPT docs