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Ella IMS

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Ella IMS lets subscribers of a private 4G or 5G network make voice and video calls. It is an IP Multimedia Subsystem (IMS) that runs as a single application, designed to be easy to operate, reliable, and secure.

Key features

  • Voice and video calls over 4G (VoLTE) and 5G (VoNR).
  • SIM-based authentication with your existing HSS (IMS-AKA over Cx), and IPsec between phones and the IMS.
  • Voice QoS from the 4G or 5G core: PCRF over Rx, or PCF over N5 with optional mutual TLS.
  • Application Servers: connect voicemail, conferencing, supplementary services and other services, routed per subscriber by your HSS (iFCs over ISC).
  • Push-to-talk: a built-in MCPTT server for group calls with floor control, and an Android client.
  • Call records: who called whom, when, for how long, and how the call ended.
  • Easy to operate: a single binary with an embedded database, a web UI, an HTTP API, and Prometheus metrics.

In this documentation

  • Tutorials

    Start here: a hands-on introduction to Ella IMS. Make your first voice call.

  • How-to Guides

    Step-by-step guides covering key operations and common tasks.

  • Reference

    Technical information - API, configuration, metrics, and more.

  • Explanation

    Discussion and clarification of key topics.