SANDEEP KUMAR PENCHALA 2025. ENTERPRISE-GRADE MOBILE PUSH-TO-TALK SYSTEMS FOR EMERGENCY SERVICES: ARCHITECTURAL FRAMEWORKS, SECURITY PARADIGMS, AND PERFORMANCE OPTIMIZATION. TPM – Testing, Psychometrics, Methodology in Applied Psychology. 32, S9 (Dec. 2025), 2408–2423. DOI:https://doi.org/10.5281/zenodo.18043541.