ISSI CSSI Interface

P25 ISSI and CSSI interface test solution
ISSI CSSI Interface

P25 ISSI and CSSI interface test solution


The ISSI & CSSI interface test solution from Valid8 enables conformance or load testing of these interfaces in the P25 public safety network.

What It Can Do For You

Simulates RFSSs, consoles and mobile radios to test equipment on the ISSI & CSSI interfaces.

Why It’s Different

  • Scalable software-based architecture can run on a range of hardware from COTS and high-end customer provided hardware to Virtual Machines and the Cloud (e.g. Amazon AWS) for maximum versatility and performance
  • Web-based UI is easy to learn
  • HTTP API enable integration with automation test systems andother equipment
  • Stateful modeling provides accurate emulation of networkelements


  • Tests RFSSs
  • Measure Key Performance Indicators (KPIs) such as number of simultaneous sessions and Busy Hour Call Attempts (BHCA)
  • Check power-on, registration, and PTT voice calls
  • Registration load
  • SG and SU call load
  • RTP PTT IMBE/AMBE media file playback
  • Report on media received, call connect time, call duration, jitter, packet loss
  • Generate valid and invalid/negative messages and call-scenarios
  • Supports sending invalid responses including malformed, dropped and misordered packets
  • Alerts and notifications
  • Check parameters in messages from SUT and flag errors


  • RFSS
  • Dispatch Console
  • ISSI Gateway
  • Call Attempts
  • Call Successes
  • Call Failures
  • Registration Attempts
  • Registration Successes
  • Registration Failures
  • 3xx Failures
  • 4xx Failures
  • 5xx Failures
  • Call setup time
  • Call tear down time
  • Media Tx Packets (audio)
  • Media Rx Packets (audio)
Configurable Parameters
  • ‍Call session length
  • Concurrent calls/endpoints

Automation API

User commands can be fully automated using REST API. This includes performing all test control functions as well as collecting results and metrics. It can be integrated into virtually any CI system via the HTTP API, including Jenkins, CircleCI, Gitlab and others.


The application’s subsystems can be edited directly in the browser using TDL or by using the graphical tools. The Message Workshop allows for creating of test scenarios directly from the hex stream of a remote capture, while the Graphical Editor (on the feature roadmap for 1Q 2020) will allow for creating customized call scenarios by dragging and dropping the call flow to meet your test needs.

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Use Cases

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ISSI CSSI Interface
ISSI CSSI Interface

Summary of Specifications






Product Details

ISSI CSSI Interface

Valid8 exports its products strictly in accordance with all US Export Control laws and regulations which shall apply to any purchase or order. Specifications are subject to change without notice.

500 West Cummings Park, Suite 6550 Woburn, MA 01801
p: +1-855-482-5438
f: +1-781-996-3708

Ordering Information

Product Name: Conformance ISSI 

Product Code: conformance-issi

Product Name: Conformance CSSI 

Product Code: conformance-cssi

Product Name: P25 Load Tester 

Product Code: p25-load-tester

Datasheet Page

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