Telecom X developer platform
Got an idea?
Build it on real telephony.
Phone numbers, mobile subscriptions, hosted PBX, SIP trunks, internet and TV. Telecom X runs all of it for Danish businesses, and every part is open to you through one REST/JSON API with realtime events. No other Danish operator gives developers this much access.
What will you build?
The API is not a side door. It is the platform itself: every Telecom X portal and app, and products like Playmaker and Flexcare, run on exactly the same endpoints you get.
Call-aware apps
React the moment a call starts, is answered or ends. Pop the caller up in your CRM, log every call automatically, show who is on the phone.
Realtime API →Smarter switchboards
Drive hosted PBX from your own system: dialplans, voicemail, recordings, conferences, phonebooks and call statistics.
PBX API →Your own mobile product
Create and manage mobile subscriptions on TDC's and Telenor's networks: SIM changes, usage, roaming, call forwarding and call records.
MVNO API →Voice and AI
Text-to-speech and speech-to-text with a choice of voices and engines, for voice bots, announcements and transcription.
Voice API →TV and streaming
Channels, EPG, packages, recordings, set-top boxes and app clients: everything behind our IPTV service.
IPTV API →Automated back office
Customers, products, number porting, invoices and integrations with systems like e-conomic. Keep your own systems in sync.
Integrations →Explore the API
Every area works the same way: log in once, then call plain JSON endpoints with your token. Pick a starting point.
Telephony & PBX
450+ pagesHosted PBX, SIP trunks, phone numbers, porting, routing and call records.
Customers & billing
160+ pagesCustomers, users, products, invoices, help center and third-party integrations.
Customers Employees Products Invoices Integrations HelpCenter
Platform & tools
100+ pagesAuthentication, the error format, search, files, logs and a toolbox of utilities.
Mobile
80+ pagesMobile subscriptions on TDC and Telenor, SIM cards, roaming and usage.
Healthcare
80 pagesFlexcare: video calls, tablets, set-top boxes and device management for care.
Internet & network
70+ pagesFiber and xDSL, 5G routers and other network devices, DNS and ZeroTier.
Messaging
20+ pagesSend SMS, manage mailboxes, and brand your e-mail, SMS and PDF templates.
Get started
- Get accessAlready a Telecom X customer or reseller? Use the login you have. New here? Write to info@telecomx.dk or call 70 30 50 50 and tell us what you want to build.
- Log in, get a tokenOne call to /auth/login returns a token. It stays valid while you use it; see Authentication for long-lived and read-only tokens.
- Call any endpointSend the token as
Authorization: Bearer. Every reply is JSON, and errors always come back in the same format. - Go realtimeConnect a socket.io client to realtime.telecomx.dk with the same token and subscribe to call, PBX and config events.
# Log in. The reply contains a token. curl -s https://api.telecomx.dk/auth/login \ -H 'Content-Type: application/json' \ -d '{"username": "you@example.com", "password": "your password"}' # Use the token on every request. curl -s https://api.telecomx.dk/ping -H 'Authorization: Bearer <token>'
Let your AI assistant read the docs
The whole wiki is available over the Model Context Protocol at https://wiki.telecomx.dk/mcp. Connect Claude, Cursor or any other MCP-capable client, and ask it to find the right endpoint, read the reference and write the integration with you.
Claude Code:
claude mcp add --transport http telecomx-wiki https://wiki.telecomx.dk/mcp
Claude Desktop (in claude_desktop_config.json, requires Node.js):
{ "mcpServers": { "telecomx-wiki": { "command": "npx", "args": ["-y", "mcp-remote", "https://wiki.telecomx.dk/mcp"] } } }
Good to know
- Realtime reference: connecting, channels and every event type
- Error responses: the format every error follows
- Regions and countries: which country belongs to which region
- Tested clients: phones, ATAs and PBXes we have tested
- PBX star codes: feature codes users can dial
- For customers and partners (sign-in required): voicemail and queues on third-party PBXes, STB and tablet developer documentation
Have an idea? Let's build it together.
Tell us what you want to make. We will give you a technical walkthrough of the platform and get you set up.
Found a mistake in the docs, or missing something? Write to pm@telecomx.dk. · Sign in
