The document can be downloaded using the link below:

P25 Frequently Asked Questions V1.9 2025

A sample of the questions are listed below. 

Many of the answers include hot links to TIA, PTIG, and other government websites for additional detailed information on Project 25.

  • What is Project 25 (P25)?
  • Where can I get a copy of P25 Standards documents?
  • Where can I view the latest Changes and Updates to the P25 Standards and future work in progress?
  • How do I find which operational requirements and features are covered in the P25 Suite of Standards?
  • How are P25 Standards documents created? 
  • What is the DHS P25 Compliance Assessment Program (CAP)?
  • What are the Benefits of Project 25?
  • What are the key considerations for purchasing interoperable P25 equipment?
  • Where can I find information on Best Practices for P25 Security, programming, and Key management?
  •  Are there Standards for LMR-LTE Interworking?

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