# VanceTel

> The programmable phone system you build your workflows around. A real softphone (iOS, iPad, Mac, Apple Vision Pro, desktop and web) with a production REST API, webhooks, deep links and an MCP server behind it — the developer-friendly middle ground between a CPaaS and a closed softphone app.

VanceTel lets developers send programmable SMS and MMS, place click-to-call deep links, sync contacts, turn website chat into two-way SMS, and react to HMAC-signed webhooks — then embed calling and texting into their own software, CRM and dashboards. The public API is write/action and webhook oriented. The primary call to action is "Book a demo".

## Get started
- [Introduction](https://vancetel.com/developers/docs.md): Developer documentation for the programmable softphone, SMS and voice API — send messages, place calls, sync contacts, and subscribe to webhooks.
- [Quickstart](https://vancetel.com/developers/docs/quickstart.md): Send your first SMS with the API in a few minutes — get a key, make one request, and watch it arrive in the softphone.
- [Authentication](https://vancetel.com/developers/docs/authentication.md): Authenticate API requests with a bearer API key, keep it server-side, and rotate keys safely.
- [API reference](https://vancetel.com/developers/docs/api-reference): Interactive VanceTel API reference — every endpoint with a live "try it" console.

## Messaging
- [Send an SMS](https://vancetel.com/developers/docs/sms.md): Send an SMS or MMS from a business number with one POST, read the message object, and track delivery with signed delivery-receipt webhooks.
- [Group SMS](https://vancetel.com/developers/docs/group-sms.md): Open a multi-participant SMS conversation, thread every reply into one stable conversation, and add or remove participants over the API.
- [Opt-out & compliance](https://vancetel.com/developers/docs/opt-out.md): Automatic STOP/START/HELP handling, blocked-recipient rejection before send, and TCPA and A2P 10DLC context for compliant business SMS.

## Voice & contacts
- [Deep links](https://vancetel.com/developers/docs/deep-links.md): Use deep links to launch a call or a pre-addressed text in the softphone from any button, record or dashboard — the recipient is pre-filled for one-tap dialing.
- [Contacts](https://vancetel.com/developers/docs/contacts.md): Create and retrieve contacts with the API — sync people into the shared softphone directory so inbound calls and texts resolve to a known name.

## Events
- [Webhooks](https://vancetel.com/developers/docs/webhooks.md): Subscribe to webhooks for inbound messages, delivery receipts and call events — verify the HMAC-SHA256 signature, return 2xx fast, and deduplicate by event id.
- [Errors](https://vancetel.com/developers/docs/errors.md): Understand API errors — the error object shape, HTTP status codes, example payloads, and how to handle failures from the messaging and contacts endpoints.
- [Rate limits](https://vancetel.com/developers/docs/rate-limits.md): How API rate limits work — per-key limits, the 429 response and Retry-After header, exponential backoff, and a retry-on-429 loop in Node and Python.

## Agents
- [MCP server](https://vancetel.com/developers/docs/mcp.md): Let AI agents and Claude Code act on your phone system — send a text, create a contact, check message status — via the VanceTel MCP server.

## Reference
- [API changelog](https://vancetel.com/developers/docs/changelog.md): Reverse-chronological changelog for the VanceTel API — new endpoints, webhooks, and breaking-change notices.

## Product
- [Softphone app](https://vancetel.com/developers/softphone): calling on iOS, iPad, Mac, Apple Vision Pro, desktop and web
- [Programmable SMS API](https://vancetel.com/developers/sms-api): two-way SMS/MMS, delivery receipts, auto opt-out
- [Website chat to SMS](https://vancetel.com/developers/web-chat-to-sms): a chat widget that becomes a two-way SMS thread
- [MCP server](https://vancetel.com/developers/mcp): let agents and Claude Code act on the phone system
- [Deep links](https://vancetel.com/developers/deep-links): click-to-call and click-to-text, with an optional pre-filled draft message (never auto-sent)
- [Contacts API](https://vancetel.com/developers/contacts-api): create/sync contacts, caller-ID resolution
- [Webhooks](https://vancetel.com/developers/webhooks): inbound messages, delivery receipts, call events (HMAC-SHA256)

## Use cases
- [Second phone line app](https://vancetel.com/developers/second-phone-line-app): a dedicated business number on your personal cell, with separate calls, texts and voicemail
- [Virtual phone system](https://vancetel.com/developers/virtual-phone-system): auto-attendant, call routing, extensions and a shared inbox — 100% cloud, no hardware
- [Business VoIP app](https://vancetel.com/developers/business-voip-app): HD calling that syncs across every device, with call flip and a central admin dashboard
- [Sales phone system & dialer](https://vancetel.com/developers/sales-phone-system): click-to-dial from any list, CRM connected via the API + webhooks, call recording and analytics

## Compare
- [vs Twilio](https://vancetel.com/developers/compare/twilio): the API plus a finished softphone — less assembly
- [vs OpenPhone](https://vancetel.com/developers/compare/openphone): add a real API, webhooks, deep links and MCP
- [vs Aircall](https://vancetel.com/developers/compare/aircall): programmability plus SMS automation

## Pricing
- [Pricing](https://vancetel.com/developers/pricing): Developer (free sandbox), Team, Business, Enterprise (BAA + SLA available). Indicative; confirmed during a demo.

## More
- [Glossary](https://vancetel.com/developers/glossary): softphone, CPaaS, A2P 10DLC, E.164, MCP server, two-way SMS, click-to-call, HMAC webhooks