Project 25 Technology Information Group

Monday, November 18, 2019

Project 25 Technology Information Group

Why Utilities Deploy P25


The P25 digital standard, originally designed for public safety, is making inroads with North American utilities.

By David Deacon

April-May 2017 Mission Critical Communications •


Use the link below to access the full article:


Excerpt from the Mission Critical April May Utilities article:

“Many electric utilities are integrating P25-compliant technology into their radio systems. P25, a mature digital radio standard in use for 25 years, has not remained static. As the session initiation protocol (SIP) and real-time transport protocol (RTP) world of IP signaling evolved, P25 followed suit with the introduction of the Inter RF Subsystem Interface (ISSI), a network-tonetwork interface, and the Console Subsystem Interface (CSSI), a standard interface for connecting thirdparty consoles to the radio network. These interfaces offer customer choice and competition among multiple P25 suppliers.

After 25 years of evolution, P25’s array of supplementary services and features is extensive. P25 is flexible and versatile, allowing manufacturers to add features such as man-down emergency call, transmit-and-receive cycling and request-to-talk (RTT) callback, a feature commonly used in the utility industry.  While RTT is not defined within the P25 standard, both the CSSI and Common Air Interface (CAI) are flexible enough to introduce the signaling required to support it in both the consoles and radio terminals.”

David Deacon is founder and CEO of Etherstack. During the past 20 years, Etherstack has developed and licensed LMR technologies in Project 25 (P25), TETRA, Digital Mobile Radio (DMR) and NXDN to manufacturers around the world

Project 25 Technology Interest Group Publishes New P25 System Lists


New Updated P25 Systems Lists for March 2017 are now available on the website.  There are updated lists for both P25 Trunking Systems and P25 Conventional Systems.  

Thanks to Ken Brown for his work as the primary author for these documents.

Since the lists were last published in June of 2016:

  • The P25 Trunking Systems list has 84 new systems added.
  • The P25 Conventional List has 35 new systems added.

 Both lists are organized by State or territory.  Systems are included for  the USA, UK, Australia, Canada, and New Zealand.  The data for each system includes Location, System Name, System type, P25 Phase 1 or P25 Phase 2, and the frequency band or bands used in the system.


The files can be accessed on the   Website Homepage by clicking the Blue quick link boxes for:

  • List of P25 Trunking Systems
  • List of P25 Conventional Systems




The Project 25 Technology Interest Group is pleased to welcome Valid8 as our newest PTIG member., Inc. is a global leader in feature, conformance and load testing for Wireless and Wireline Networks. Their cutting-edge technology delivers the tools necessary to validate new and emerging telecom products and software applications. Valid8 offers a broad range of supported protocols and cost-effective stress, feature, negative test and device emulation solutions for industry. Most recently they presented a network testing solution for the Project 25 ISSI/CSSI  interface at the TIA TR-8 Meetings in Orlando.


Valid8 Business Development Contact 


Name: Ian Carpenter

E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Phone: +1 781 938 1221

Toll Free phone: 1 855 4 VALID8

Mailing Address:



500 W Cummings Park,

Suite 6550

Woburn, MA 01801

Company website:

Project 25 Technology Interest Group (PTIG) Welcomes RF Technology as a New Member.

The Project 25 Technology Interest Group is pleased to welcome RF Technology and RF Technology Americas as a new PTIG corporate member.

RF Technology Pty Ltd was established in 1989 with a charter to design, manufacture and market radio communications equipment worldwide.

With manufacturing and sales offices in both Australia and the US, RF Technology products are marketed worldwide. RF Technology’s P25 repeaters have been sold into many Public Safety and Government applications, including Australian Customs, Defense, Netherlands Coast Guard and USA TSA, Homeland Security.

RF Technology is innovating leading technology for affordable P25 Simulcast, Data and Trunking solutions, private LTE, narrow band high speed data and has deployed systems successfully throughout the world. An on-going R&D program ensures a continuous stream of new and associated products in order to maintain the technical edge that they have gained.

RF Technology’s Primary Business Development Contact:

Doug Musser, Sales Manager

E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Phone: 662 665 0813

Company WEB site:,,

Mailing Address:

17791 Mitchell North

Suite C

Irvine CA 92614

TIA TR-8 Meeting Report and Project 25 Standards Update

Orlando FL January 31-February 2 2017      Andy Davis TIA TR-8 Chairman




This document highlights TR-8 accomplishments and work in progress for 2017. The document will be updated after every TR-8 face to face meeting occurring in 2017. The filename reflects the date of the latest update. After the first 2017 version, each update will use blue font to indicate the updates.


Please use the link below to download the full document.




Project 25 Standards Update 2-02-17





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