Introduction and Goals

Scope

GOnnect is a cross-platform Unified Communications client built with Qt/QML that provides:

SIP voice calling capabilities
Contact aggregation from multiple sources (LDAP, CardDAV, Akonadi, EDS)
Calendar integration (CalDAV, Akonadi, EDS)
Instant messaging support
Jitsi Meet integration for video conferences
System tray integration with custom window decoration
Multi-platform support (Linux, Windows, macOS (experimental))

The application targets enterprise and professional users requiring reliable communication tools with integration into corporate infrastructure.

System Context

Stakeholders and Interests

Stakeholder	Interest
End Users	Reliable call quality, intuitive UI, seamless contact/calendar integration
System Administrators	Easy deployment, configuration management, monitoring
Security Team	Encrypted communications, secure credential storage, compliance
Developers	Maintainable codebase, clear architecture, testability
Product Managers	Feature flexibility, platform support, performance

Stakeholder

Interest

End Users

Reliable call quality, intuitive UI, seamless contact/calendar integration

System Administrators

Easy deployment, configuration management, monitoring

Security Team

Encrypted communications, secure credential storage, compliance

Developers

Maintainable codebase, clear architecture, testability

Product Managers

Feature flexibility, platform support, performance

Goals

Technical Goals

Cross-platform compatibility (Linux, macOS, Windows)
High call quality with adaptive codec selection
Low resource consumption and fast startup
Reliable background operation (system tray, autostart)
Comprehensive logging and debugging capabilities

Non-Technical Goals

User-friendly interface with minimal training required
Flexible configuration for diverse deployment scenarios
Extensibility through plugin architecture (contact sources, chat plugins)
Internationalization support (i18n)
Open source development model

Out of Scope

PSTN gateway functionality
PBX server functionality
Mobile platform support (iOS, Android)

Definition of Terms

Term	Definition
SIP	Session Initiation Protocol (RFC 3261)
AOR	Address of Record - SIP URI identifying a user
SRTP	Secure Real-time Transport Protocol
ICE	Interactive Connectivity Establishment (RFC 5245)
STUN	Session Traversal Utilities for NAT
TURN	Traversal Using Relays around NAT
CardDAV	Contacts distributed via CalDAV protocol
CalDAV	Calendar distributed via CalDAV protocol
RTT	Real-time text (RFC 4103)

Term

Definition

SIP

Session Initiation Protocol (RFC 3261)

AOR

Address of Record - SIP URI identifying a user

SRTP

Secure Real-time Transport Protocol

ICE

Interactive Connectivity Establishment (RFC 5245)

STUN

Session Traversal Utilities for NAT

TURN

Traversal Using Relays around NAT

CardDAV

Contacts distributed via CalDAV protocol

CalDAV

Calendar distributed via CalDAV protocol

RTT

Real-time text (RFC 4103)

General Constraints

Must use Qt6 framework for cross-platform GUI
Must use PJSIP library for SIP stack implementation
Must support C++17 standard
Must follow Qt coding conventions
Must be buildable with CMake and Conan dependency management
Must support Flatpak packaging for Linux distribution
Must comply with DCO (Developer Certificate of Origin) for contributions