Project 25 Technology Information Group

Monday, November 18, 2019

Project 25 Technology Information Group

P25 ISSI/CSSI Interoperability 

P25 ISSI/CSSI Documents and Papers


P25 ISSI/CSSI Primer

Full Document Link: P25 ISSI/CSSI Primer SAFECOM-FPIC-NCSWIC

This document’s purpose is to introduce the Inter-RF Subsystem Interface (ISSI) and Console Subsystem Interface (CSSI) technologies and highlight potential benefits and uses, discuss the existing Project 25 (P25) LMR standards that govern the technologies, briefly introduce some of the challenges associated with the implementation of the standards, and discuss how best to address these challenges in the future.

The document was developed by SAFECOM, The Federal Partnership for Interoperable Communications (FPIC) and the National Council of Statewide Interoperability Coordinators (NCSWIC)


P25 ISSI/CSSI Best Practices 

Full Document Link: P25 ISSI/CSSI Best Practices Guide FPIC-SAFECOM-NCSWIC

This document’s purpose is to outline components for practitioners to consider when planning for and implementing an ISSI or CSSI implementation. The high-level components are rooted in best practices observed during all project phases by local, county, regional, and state agencies implementing ISSI/CSSI and are provided as a resource for others in the community who may be contemplating or implementing ISSI/CSSI


ISSI/CSSI Non-CAP Interoperability Testing Template

Manufacturers have been doing lab to lab testing of commonly supported ISSI/CSSI standard feature sets for some time now.

This template describes a method for reporting ISSI and/or CSSI P25 Interoperability testing results outside CAP.

At the time of this template’s publication, there were no ISSI or CSSI testing results available yet from the DHS OIC Compliance Assessment Program (CAP)

The template allows reporting on interoperability of testing equipment from two manufacturers. That testing may have been performed in a single lab, in a lab to lab setting or in an installed customer setting. That testing may have been performed by personnel with or without ISO/IEC 17025 recognition.

The template does not intend to prescribe a list of standard functionality that could or should be tested. The functionality covered by a published report should be determined by the manufacturers completing the report. The PTIG P25 Capabilities Guide may be used as a reference for P25 features and testing methods included in published P25/TIA-102 standard documents. 

A copy of the template can be downloaded using the link below: 

ISSI/CSSI Non-CAP Interoperability Testing Template 

The PTIG P25 Capabilities Guide


ISSI/CSSI Non-CAP Interoperability Test Reports

190220 MSI-Avtec Non CAP ISSI/CSSI Interoperability Test






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