> For the complete documentation index, see [llms.txt](https://diameter.learn-telecom.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://diameter.learn-telecom.com/diameter-interfaces.md).

# Diameter Interfaces

- [IMS Interfaces](https://diameter.learn-telecom.com/diameter-interfaces/ims-interfaces.md)
- [EPC Interfaces](https://diameter.learn-telecom.com/diameter-interfaces/epc-interfaces.md)
- [PCC Interfaces](https://diameter.learn-telecom.com/diameter-interfaces/pcc-interfaces.md)
- [3GPP Systems](https://diameter.learn-telecom.com/diameter-interfaces/3gpp-systems.md)