InterTalk is your advanced P25 console solution

Project 25 (P25) is the standard for digital wireless communications products. Governed by the Telecommunications Industry Association (TIA), and developed with input from public safety officials at the local, state, and federal levels, P25 is administered by the TIA’s Mobile and Personal Private Radio Standards Committee known as TR-8. P25 technology has many benefits to its end users, including interoperability, integrated voice and data, easy migration, competitive procurement opportunities, and spectral efficiency.

The benefit to you? InterTalk is a key supporter of open-standards for public safety radio networks within North America. InterTalk was the first console system manufacturer to support the Console Sub-System Interface (CSSI) for P25, allowing our console systems and products to work with any compliant P25 radio network system. The CSSI is built upon the Inter Sub-System Interface (ISSI) which means that InterTalk's console system can support simultaneous multiply-connected P25 systems. InterTalk consoles have successfully integrated with various 3rd party P25 infrastructure providers, including Harris, Cassidian, Motorola, and Tait. Whatever your system, InterTalk can and will support it.

InterTalk is a proud member of both the Project 25 Technology Interest Group, and the Telecommunications Industry Association.

Supported P25 Interfaces

  • Trunked Inter-RF Subsystem Interface (ISSI)
  • Trunked Console Subsystem Interface (CSSI)
  • Conventional Inter-RF Subsystem Interface (ISSI)
  • Analog Fixed Station Interface (AFSI)
  • Digital Fixed Station Interface (DFSI)

Supported P25 Voice, Console, and Supplementary Features

Unaddressed Voice Call N/A
Voice Group Call
Announcement Group Call N/A
Broadcast Voice Call N/A
System Voice Call N/A
Individual (Unit-to-Unit) Call
Emergency Group Call
Emergency Unit Call
Call Prioritization
Call Pre-emption
Call Interrupt
Emergency Alarm
Emergency Alarm Cancel
Group Emergency Cancel
Talking Party Identification
Discreet Listening
Radio Unit Monitoring
Audible Signaling
Radio Inhibit/Unhibit
Radio Check
Status Request
Status Update
Call Alert
Short Messaging
Radio Detach N/A
AES / DES Encryption
Console Priority


Supported TIA Standards

TSB-102.BACC-B Nov. 2011 ISSI Overview
TIA-102.BACA-B Nov. 2012 ISSI Messages and Procedures for Voice and Mobility Management Services
TIA-102.BACD-B Nov. 2011 ISSI Messages and Procedures for Supplementary Data Services
TIA-102.BACE Jun. 2008 ISSI Messages and Procedures for Conventional Operation
TIA-102.BAHA Jun. 2006 FSI Messages and Procedures
TIA/EIA-102.AAAA-A Feb. 2001 DES Encryption Protocol
TIA/EIA-102.AAAD.A Aug. 2009 Block Encryption Protocol
TIA-102.BABA May 1998 Vocoder Description
TIA-102.BABA-1 Jul. 2009 Half-Rate Vocoder Annex


Tested Against the Following Standards

TSB-102.CACC Jan. 2009 ISSI Conformance Test Procedure
TIA-102.CACC-1 Aug. 2011 ISSI Conformance Test Procedure - Addendum 1 - Supplementary Data
TIA-102.CBBK-A Mar. 2010 Recommended Compliance Assessment Tests - Trunking ISSI
TIA-102.CACD-A Feb. 2010 ISSI Interoperability Test Procedures for Trunked Systems Involving the ISSI
TIA-102.CACB Apr. 2007 ISSI Performance Recommendations for Voice Services
TIA-102.CACB-1 Dec. 2008 ISSI Performance Recommendations for Voice Services - Addendum 1 - Trunked Console ISSI
TIA-102.CACA Apr. 2007 ISSI Measurement Methods of Voice Services
TIA-102.CACA-1 Dec. 2008 ISSI Measurement Methods of Voice Services - Addendum 1 - Trunked Console ISSI
CAB Document Mar. 2010 P25-CAB-ISSI_TEST_REQ: ISSI Testing Requirements


NIST Standards for Crypto Module

FIPS PUB 140-2 Jan. 1994 Security Requirements for Cryptographic Modules
FIPS PUB 197 Nov. 2001 Advanced Encryption Standard (AES)
FIPS PUB 46-3 Oct. 1999 Data Encryption Standard (DES)