# VanceTel API VanceTel is a programmable phone system: a real softphone app with a production REST API, webhooks, deep links and an MCP server behind it. Use the API to send SMS and MMS, place click-to-call deep links, sync contacts, and react to inbound messages and call events — everything your team sees in the softphone is also reachable from your own software. The public API is **write- and event-oriented**: you create and send (messages, contacts, deep links) and you subscribe to webhooks for inbound activity. The softphone app surfaces the full conversation and call history in real time. ## Base URL All API requests go to a single versioned base URL over HTTPS: ```bash https://api.netexem.com/v1 ``` ## What you can build - **Programmable SMS & MMS** — two-way messaging from dedicated business numbers, with delivery receipts and automatic opt-out handling. See [Send an SMS](/developers/docs/sms). - **Click-to-call & deep links** — launch a call or a pre-addressed text from any button or record. See [Deep links](/developers/docs/deep-links). - **Contacts** — create and sync contacts on the fly; resolve caller ID. See [Contacts](/developers/docs/contacts). - **Webhooks** — subscribe to inbound messages, delivery receipts and call events, each HMAC-signed. See [Webhooks](/developers/docs/webhooks). - **MCP server** — let agents and Claude Code act on the phone system in the loop. See [MCP server](/developers/docs/mcp). ## Next steps 1. [Quickstart](/developers/docs/quickstart) — send your first text in a few minutes. 2. [Authentication](/developers/docs/authentication) — get and use an API key. 3. [API reference](/developers/docs/api-reference) — every endpoint, with a built-in console to try it live.