Skysay connects AI assistants and voice agents to phone numbers, calls, SMS and campaigns. Use the hosted MCP endpoint over Streamable HTTP with OAuth or scoped API keys. Workspace permissions are tenant-bound, with separate authorization for supported actions. Calling, messaging and number provisioning are usage-based. Setup: https://skysay.ai/docs/mcp Number availability, capabilities and verification requirements vary by country. 100+ countries covered.