(1) Vendor needs to provide unified communications and VoIP telephone system. • Centralized, web–based administration console for user, extension, and call flow management. • Role–based administrative access with audit logging. • Microsoft 365 / Entra ID (Azure AD) Single Sign–On (SSO) integration for secure authentication and user lifecycle management. • Outlook and Microsoft Teams interoperability, including contact synchronization, calendar presence, and click–to–call capability. • Call transfer, hold, park, pickup, conference, and intercom functionality • Voicemail–to–Email delivery with optional transcription. • Video conferencing or screen sharing integrated within the UC platform. • AI–based transcription, sentiment analysis, or call categorization tools. • Mobile device management (MDM) integration for softphone provisioning and security policy enforcement. • Speech–to–text or AI–powered virtual attendants for improved accessibility and call routing efficiency. • Cloud backup or disaster recovery synchronization for PBX configuration and voicemail data. • Entra ID (Azure AD) Single Sign–On (SSO) for user authentication, provisioning, and deactivation. • Outlook / Teams interoperability Open–standard SIP interoperability with Peerless, Comcast Business, or equivalent SIP trunk providers • Integration with Informa Cast by Singlewire for emergency notifications, paging, and bells • Must support voicemail–to–email, presence indication, busy–lamp field (BLF), call pickup, and one–touch paging to Informa cast zones. • Windows/macOS clients authenticated through Azure AD (Entra ID). • Must integrate with Microsoft Teams and Outlook presence.