Communication and Telephony

Communication platforms provide video conferencing, audio calling, messaging, and telephony services that enable distributed teams to collaborate in real time. Mission-driven organisations depend on these tools for internal coordination, partner engagement, beneficiary services, and emergency response. Platform selection determines data sovereignty, operating costs, field deployment viability, and integration with existing systems.

This benchmark covers three functional domains: video conferencing systems for synchronous meetings and webinars, team messaging platforms for persistent asynchronous communication, and telephony systems for voice infrastructure. Solutions span from lightweight browser-based tools to comprehensive unified communications platforms. Adjacent categories such as contact centre systems, emergency communications hardware, and broadcast platforms fall outside this scope.

Requirements taxonomy

This taxonomy defines evaluation criteria for communication and telephony tools. Requirements are organised by functional area and weighted by typical priority for mission-driven organisations. Adjust weights based on your specific operational context.

Functional requirements

Core capabilities that define what the tool must do.

Video conferencing

Team messaging

Telephony and voice

Collaboration features

Technical requirements

Platform architecture, deployment, and integration capabilities.

Deployment and hosting

Scalability and performance

Integration architecture

Security requirements

Security controls and data protection capabilities.

Authentication and access control

Encryption and data protection

Compliance and certification

Operational requirements

Day-to-day administration and management considerations.

Administration

Monitoring and reliability

Support

Data management requirements

Data handling, portability, and lifecycle management.

Data portability

Data retention

Commercial requirements

Licensing, pricing, and vendor considerations.

Assessment methodology

Tools are assessed against each requirement using the following scale:

Additional notation:

• $ indicates feature requires paid tier or add-on
• β indicates feature in beta or preview
• E indicates feature available in enterprise tier only
• P indicates feature requires plugin or extension
• C indicates community-provided, not vendor-supported

Functional capability comparison

Video conferencing

Assessment notes -Video conferencing:

• Jitsi Meet F1.2: Recommended maximum 75-100 participants per meeting with single Jitsi Videobridge; horizontal scaling requires multiple bridges. 500+ participants achievable with proper infrastructure.
• Jitsi Meet F1.8: Dial-in requires Jigasi component and SIP provider; not included in default deployment.
• BigBlueButton F1.2: Designed for virtual classrooms; supports 100-150 webcam users or larger audio-only audiences per server. Scalelite load balancer enables horizontal scaling.
• BigBlueButton F1.8: SIP integration available via FreeSWITCH; configuration required.
• Element Call F1.2: Based on MatrixRTC; designed for smaller group calls, recommended under 50 participants as of current release.
• Element Call F1.4: Recording not currently supported in Element Call; available in Element Enterprise.
• Zulip: Team messaging platform; video calls via Jitsi or Zoom integration rather than native capability.
• Microsoft Teams F1.1: Full browser support for Chrome and Edge; Safari and Firefox have reduced functionality requiring desktop client for optimal experience.
• Zoom F1.1: Browser client (“web client”) has reduced functionality compared to desktop application; meeting hosts can enable or restrict web client access.

Team messaging

Assessment notes -Team messaging:

• Jitsi Meet: Video conferencing focused; in-meeting chat only, no persistent messaging.
• BigBlueButton: Session-based chat during classes; not designed as persistent team messaging platform.
• Element: Full Matrix protocol implementation; rooms, spaces, threads, and comprehensive messaging features.
• Zulip: Topic-based threading model; messages organised by stream (channel) and topic for improved asynchronous communication.
• Microsoft Teams: Channels with threaded replies; integrated with Microsoft 365 ecosystem.
• Zoom F2.1: Team Chat available but secondary to meetings; basic channel structure without topic threading.

Telephony and voice

Assessment notes -Telephony:

• Asterisk: Full-featured PBX; requires SIP trunk provider for PSTN connectivity; all features depend on configuration.
• Jitsi Meet F3.8: SIP integration via Jigasi gateway; enables SIP/SRTP connectivity to external systems.
• Microsoft Teams: Telephony requires Teams Phone licence ($8-12/user/month); PSTN connectivity via Calling Plans, Operator Connect, or Direct Routing.
• Zoom: Zoom Phone separate product ($10-20/user/month); PSTN connectivity via Zoom native or BYOC (Bring Your Own Carrier).
• Element, BigBlueButton, Zulip: No native PSTN telephony; VoIP only.

Collaboration features

Assessment notes -Collaboration:

• Jitsi Meet F4.1: Excalidraw whiteboard integration available; requires configuration.
• Jitsi Meet F4.4: Etherpad integration for collaborative notes; requires configuration.
• BigBlueButton F4.1: Multi-user whiteboard built on tl;draw 2.0; extensive annotation tools designed for education.
• BigBlueButton F4.5: Shared notes, learning analytics dashboard, engagement tracking for educators.
• Zulip F4.2: Polls via built-in polls feature; integrated into messaging.
• Microsoft Teams F4.5: Copilot features require Microsoft 365 Copilot licence (additional cost).
• Zoom F4.5: AI Companion features require paid plans; includes meeting summary generation.

Technical capability comparison

Deployment and hosting

Deployment details:

Integration architecture

API details:

Security capability comparison

Authentication and access control

Authentication methods:

Encryption and data protection

Encryption details:

• Jitsi Meet: SRTP for media, E2EE available via insertable streams (Chrome-based browsers); E2EE prevents server-side processing features like recording.
• BigBlueButton: DTLS-SRTP for media; E2EE not available; server must decrypt for recording and processing.
• Matrix/Element: Megolm E2EE for encrypted rooms; device verification required for secure messaging; Element Call inherits Matrix encryption.
• Zulip: TLS in transit, encryption at rest; no E2EE for messages.
• Asterisk: SRTP configurable; TLS for SIP signalling; key exchange via SDES or DTLS-SRTP.
• Microsoft Teams: TLS/SRTP in transit; E2EE available for 1:1 calls and small meetings (premium feature).
• Zoom: E2EE available for meetings (requires enabling); restricts some features when enabled.

Compliance certifications

Notes: Self-hosted open source deployments inherit organisational certifications; certifications listed apply to vendor-hosted services where applicable.

Operational capability comparison

Administration and support

Support and maintenance

Commercial comparison

Pricing models

Total cost considerations

Vendor assessment

Individual tool assessments

Jitsi Meet

Jitsi Meet provides browser-based video conferencing with no account required for participants. The architecture consists of multiple components: nginx serves the web interface, Jitsi Conference Focus (Jicofo) manages conferences, and Jitsi Videobridge (JVB) handles media routing. A single JVB instance supports 75-100 simultaneous participants with good hardware; horizontal scaling requires deploying multiple videobridges behind a selector. The platform uses WebRTC for media transport, supporting opportunistic SRTP encryption with experimental end-to-end encryption via insertable streams in Chrome-based browsers.

Self-hosted deployment uses Debian/Ubuntu packages or Docker containers. The quick-install script provisions a working instance in under 30 minutes on a fresh Ubuntu server. Production deployments require attention to SRTP, coturn configuration for NAT traversal, and proper TLS certificate management. Token-based authentication integrates SAML, LDAP, or OIDC providers for authenticated meetings. JWT tokens provide API authentication for integration scenarios.

Key strengths:

• Zero-friction guest access: participants join via link without installation or account, reducing barriers for external stakeholders
• Complete self-hosting: all components can run on organisation infrastructure with no external dependencies
• Mature WebRTC implementation: good performance on varied network conditions with simulcast and adaptive bitrate
• Active development: regular releases with consistent feature additions and security updates

Key limitations:

• PSTN integration requires separate Jigasi component and SIP provider configuration, adding deployment complexity
• End-to-end encryption is experimental and disables server-side features including recording
• Large meeting support (500+) requires complex multi-videobridge architecture
• Administrative interface is minimal compared to commercial platforms; most configuration via files

Deployment requirements:

• Self-hosted: Ubuntu 22.04+ or Debian 11+, 4+ CPU cores, 8GB+ RAM, 100 Mbps network bandwidth for 50 participants
• Network: UDP ports 10000-20000 for media, TCP 443 for web, TURN server for restrictive networks

Integration capabilities: The iFrame API enables embedding Jitsi meetings in web applications with JavaScript control over meeting lifecycle, participant management, and events. React Native SDKs support mobile application integration. Calendar integration available via add-ons for Google and Microsoft calendars.

BigBlueButton

BigBlueButton is designed specifically for online education and virtual classrooms. The platform provides integrated presentation sharing, multi-user whiteboard based on tl;draw 2.0, breakout rooms, polling, and shared notes. Version 3.0 replaced Kurento Media Server with mediasoup for live media transmission, improving performance and reducing server resource requirements. The plugin architecture introduced in 3.0 enables extending functionality without modifying core code.

Deployment requires Ubuntu 22.04 LTS exclusively. The bbb-install.sh script automates installation including Let’s Encrypt certificate provisioning. Production deployments benefit from the Scalelite load balancer for distributing meetings across multiple BBB servers. LMS integration is a primary use case, with plugins available for Moodle, Canvas, and other learning management systems.

Key strengths:

• Purpose-built for education: whiteboard tools, breakout rooms, learning analytics, and engagement features optimised for instructional use
• Presentation-centric: native support for uploading and annotating presentations
• Recording with playback: sessions record to accessible format with chapters, searchable content
• Strong LMS integration: native support for LTI 1.3, extensive Moodle integration

Key limitations:

• High resource requirements: minimum 8 CPU cores, 16GB RAM, 500GB storage for production
• Single OS support: Ubuntu 22.04 LTS only; no container-first deployment
• No end-to-end encryption: server decrypts all media for processing
• Limited mobile experience: mobile browser support varies; no dedicated mobile apps

Deployment requirements:

• Ubuntu 22.04 LTS (64-bit), 8+ CPU cores, 16GB+ RAM, 500GB+ storage
• Dedicated server recommended (bare metal or VM with dedicated resources)
• Network: IPv6 support, ports 80, 443, UDP 16384-32768 for media

Integration capabilities: REST API with shared secret authentication enables programmatic meeting creation, management, and retrieval of recordings. Webhooks provide real-time event notifications. LTI 1.3 integration allows seamless embedding in learning management systems. Greenlight provides an optional web frontend for users without LMS integration.

Matrix Protocol and Synapse

Matrix is an open standard for secure, decentralised real-time communication. The protocol defines APIs for synchronisation of JSON data over federation, enabling independent servers (homeservers) to communicate while maintaining conversation continuity. Synapse is the reference homeserver implementation, developed by Element. Matrix 2.0 development focuses on Simplified Sliding Sync for improved performance and MatrixRTC for native voice/video.

End-to-end encryption via Megolm is a core Matrix feature, providing cryptographic verification that messages can only be read by intended recipients. Device verification through cross-signing enables users to establish trust across their devices. Matrix Authentication Service (MAS) provides OIDC-based authentication for homeservers.

Key strengths:

• Federation: organisations run own servers while communicating with wider Matrix network or partner organisations
• True end-to-end encryption: Megolm encryption for rooms, device verification, cryptographic identity
• Extensible protocol: supports rooms, spaces (groups of rooms), threads, VoIP, and custom event types
• Bridge ecosystem: bridges available for Slack, IRC, WhatsApp, Telegram, and other platforms

Key limitations:

• Resource consumption: Synapse resource usage grows with room history and federation; large deployments require optimisation
• Complexity: running a federated homeserver requires understanding of Matrix concepts
• Feature parity: not all clients implement all protocol features consistently
• Call quality: Element Call is newer than competitors; voice/video features still maturing

Deployment requirements:

• Linux server, PostgreSQL 14+, Python 3.9+
• Resources scale with user count: 4 CPU/8GB RAM for small (under 1,000 users), significantly more for larger
• Network: TCP 443 for client, TCP 8448 for federation

Integration capabilities: Client-Server API provides comprehensive access to Matrix functionality. Application Service API enables building bots, bridges, and custom integrations. Widgets allow embedding external content in Matrix rooms. OIDC integration via MAS enables enterprise SSO.

Element

Element is the primary Matrix client, developed by the company behind the Matrix protocol. Element Web provides a full-featured browser and desktop experience, while Element X represents the next-generation mobile client built on the Matrix Rust SDK with significant performance improvements. Element Enterprise adds administrative features, compliance tools, and support.

Element Call provides native Matrix voice and video conferencing based on MatrixRTC, inheriting Matrix’s end-to-end encryption. Spaces organise rooms into hierarchical structures for teams or communities. Threads enable focused discussions within rooms without fragmenting conversation flow.

Key strengths:

• Comprehensive Matrix implementation: full protocol support including E2EE, spaces, threads
• Cross-platform: web, desktop (Electron), iOS, Android with account sync
• Data sovereignty: self-host the client alongside Synapse for complete control
• Element X performance: new mobile clients offer significant speed improvements

Key limitations:

• Learning curve: Matrix concepts (rooms, spaces, homeservers) require user education
• Resource usage: desktop app via Electron consumes significant memory
• Enterprise features: advanced compliance and admin tools require Element Enterprise
• Element Call maturity: voice/video features newer than dedicated conferencing platforms

Deployment requirements:

• Element Web: static hosting (nginx, S3, etc.) with configuration file
• Element Desktop: electron app for Windows, macOS, Linux
• Backend: requires Matrix homeserver (Synapse or compatible)

Zulip

Zulip is a team communication platform distinguished by its topic-based threading model. Every message belongs to a stream (channel) and topic, enabling organised asynchronous communication where participants can catch up on specific discussions without reading entire channel histories. This model particularly suits distributed teams across time zones. Server 11.0 introduced message reminders, channels without topics for casual chat, and channel folders for organisation.

The platform provides comprehensive API access, over 100 built-in integrations, and a mobile app rebuilt with Flutter in 2025 for improved performance. Zulip sponsors free Cloud Standard hosting for eligible open source projects, nonprofits, educational institutions, and academic research groups.

Key strengths:

• Topic threading: messages organised by topic within streams, enabling effective asynchronous communication
• Comprehensive search: full-text search with powerful filters across message history
• Strong API: well-documented API enables custom integrations and automation
• Nonprofit programme: free Cloud Standard hosting for qualifying organisations

Key limitations:

• Learning curve: topic model requires adjustment from channel-only platforms
• No native video: video calls via Jitsi or Zoom integration rather than built-in
• No end-to-end encryption: messages encrypted in transit and at rest, not E2EE
• Desktop app Electron-based: higher resource usage than native applications

Deployment requirements:

• Self-hosted: Ubuntu 22.04/Debian 12, PostgreSQL, 2+ CPU, 4GB+ RAM
• Network: standard web ports, optional email configuration for notifications

Integration capabilities: REST API provides full access to messages, streams, users, and settings. Webhooks support incoming notifications from external services. Bot framework enables interactive bots within Zulip. Native integrations available for GitHub, JIRA, Sentry, and 100+ services.

Asterisk

Asterisk is an open source telephony engine that powers software PBXs, VoIP gateways, conferencing systems, and IVR applications. The platform supports multiple VoIP protocols including SIP (via PJSIP channel driver), IAX2, and WebRTC. PSTN connectivity requires SIP trunk providers or hardware cards from vendors like Sangoma and Digium. FreePBX provides a popular web-based administration interface built on Asterisk.

The Asterisk REST Interface (ARI) enables building custom telephony applications, while the Asterisk Gateway Interface (AGI) supports external application integration. Asterisk Manager Interface (AMI) provides administrative access and event monitoring.

Key strengths:

• Comprehensive telephony: full PBX feature set including IVR, queues, voicemail, conference bridges
• Protocol flexibility: SIP, IAX2, WebRTC, PSTN via trunking or hardware
• Extensive ecosystem: FreePBX GUI, large community, third-party integrations
• Customisation: dialplan scripting enables complex call routing logic

Key limitations:

• Expertise required: proper configuration requires telephony and Linux knowledge
• Security considerations: SIP exposure requires careful firewall and authentication configuration
• No managed offering: self-hosted only; managed options via third-party FreePBX providers
• Not unified communications: PBX/voice focus; separate solutions needed for team messaging, video

Deployment requirements:

• Linux (most distributions), 2+ CPU, 4GB+ RAM (varies with concurrent call capacity)
• Network: SIP ports (5060-5061), RTP ports (10000-20000), SIP trunk connectivity

Integration capabilities: ARI provides REST interface for building external applications that control call flow. AGI enables integration with external databases, APIs, and business logic. AMI provides real-time event stream and administrative commands.

Microsoft Teams

Microsoft Teams provides integrated messaging, video meetings, calling, and collaboration within the Microsoft 365 ecosystem. The platform serves as a collaboration hub with tight integration to SharePoint, OneDrive, Outlook, and other Microsoft applications. Teams Phone provides enterprise telephony with calling plans or direct routing to existing phone systems.

Teams AI capabilities include Copilot integration for meeting summaries, message drafting, and search (requires separate licence). Channel agents and AI-powered meeting features continue expanding with regular releases. Teams Rooms provides conference room systems, while Teams Phone Mobile enables mobile devices to serve as business phone endpoints.

Key strengths:

• Microsoft 365 integration: seamless file sharing, calendar, email within unified platform
• Enterprise-grade: compliance, eDiscovery, data loss prevention, retention policies
• Telephony options: Calling Plans, Operator Connect, Direct Routing for PSTN connectivity
• Regular feature updates: continuous deployment of new capabilities

Key limitations:

• Microsoft ecosystem dependency: optimal experience requires Microsoft 365 commitment
• CLOUD Act exposure: US jurisdiction applies to all data regardless of data centre location
• Complexity: extensive feature set creates steep learning curve for full utilisation
• Licensing layers: many features require additional licences (Teams Phone, Copilot, Premium)

Deployment requirements:

• Microsoft 365 subscription (Business Basic, E3, E5, or equivalent)
• Client: desktop app, mobile apps, web browser
• Admin: Microsoft 365 admin centre, Teams admin centre

Integration capabilities: Microsoft Graph API provides programmatic access to Teams data. Webhooks and connectors enable integrations with external services. Teams AI library enables building custom agents. Power Platform integration enables workflow automation.

Zoom

Zoom provides video meetings, webinars, and Zoom Phone for enterprise telephony. The platform built its reputation on video meeting reliability and ease of use, subsequently expanding to Team Chat, Whiteboard, and contact centre solutions. Zoom AI Companion provides meeting summaries, chat composition assistance, and other AI features included with paid plans.

The developer platform offers extensive APIs for meeting management, user administration, and telephony. Zoom Apps enable building applications that run within the Zoom client. Zoom Phone provides cloud PBX with calling plans or BYOC (Bring Your Own Carrier) for existing SIP infrastructure.

Key strengths:

• Reliability: consistent meeting quality that established category leadership
• Ease of use: simple meeting join experience with broad device support
• Feature breadth: meetings, webinars, phone, chat, whiteboard in unified platform
• AI Companion: meeting summaries and productivity features included with paid plans

Key limitations:

• Proprietary platform: vendor lock-in with limited self-hosting options
• US jurisdiction: CLOUD Act applies to all data regardless of region
• Feature segmentation: many capabilities require separate products (Phone) or tiers
• Zoom fatigue association: brand associated with pandemic-era overuse

Deployment requirements:

• Zoom account (free tier or paid licence)
• Client: desktop app, mobile apps, web browser (limited features)
• Admin: Zoom web portal, admin centre

Integration capabilities: REST APIs cover meetings, users, webinars, phone, and administrative functions. Webhooks provide real-time event notifications. OAuth 2.0 authentication for third-party applications. Zoom Apps SDK enables building applications within the Zoom client.

Selection guidance

Decision framework

                              +------------------+
                              | Primary need?    |
                              +--------+---------+
                                       |
         +-----------------------------+-----------------------------+
         |                             |                             |
         v                             v                             v
+--------+--------+         +----------+----------+        +---------+---------+
| Video meetings  |         | Team messaging      |        | Telephony/PBX     |
+--------+--------+         +----------+----------+        +---------+---------+
         |                             |                             |
         v                             v                             v
+--------+--------+         +----------+----------+        +---------+---------+
| Data sovereignty|         | Async-first work?   |        | Existing SIP?     |
| required?       |         |                     |        |                   |
+---+------+------+         +-----+-------+-------+        +----+--------+-----+
    |      |                      |       |                     |        |
  Yes      No                   Yes       No                  Yes        No
    |      |                      |       |                     |        |
    v      v                      v       v                     v        v
Jitsi,   Zoom,               Zulip,   Teams,              Asterisk   Teams,
BBB      Teams               Matrix   Slack*              (Direct    Zoom
                                                          Routing)   Phone

Recommendations by context

Organisations with limited IT capacity

For organisations without dedicated IT staff, vendor-managed services reduce operational burden:

Video conferencing: Zoom or Microsoft Teams provide reliable meetings without infrastructure management. Zoom’s free tier supports 40-minute group meetings; Teams Essentials provides basic functionality. Both offer nonprofit discounts that significantly reduce cost.

Team messaging: Zulip Cloud Standard is free for eligible nonprofits and provides full functionality without self-hosting complexity. Microsoft Teams bundles messaging with video if already using Microsoft 365.

Telephony: Cloud PBX services from Teams Phone or Zoom Phone eliminate on-premises equipment. Costs run $8-20 per user monthly plus calling charges. Smaller organisations may find traditional phone service or simple VoIP providers more cost-effective.

Organisations with established IT functions

Organisations with Linux administration capacity can leverage open source solutions:

Video conferencing: Jitsi Meet provides feature-complete video conferencing on organisation infrastructure. Deployment requires 4-8 hours for basic setup, ongoing maintenance for updates and scaling. BigBlueButton suits education-focused organisations with its classroom features.

Team messaging: Zulip or Matrix/Element provide self-hosted team communication. Zulip offers simpler administration; Matrix provides federation and end-to-end encryption. Both require PostgreSQL administration skills.

Telephony: Asterisk with FreePBX provides comprehensive PBX functionality. Requires telephony expertise for proper configuration. SIP trunk providers (Twilio, Telnyx, regional carriers) provide PSTN connectivity.

Organisations with data sovereignty requirements

Data sovereignty needs drive platform selection when regulations or policies require data remain within specific jurisdictions:

Self-hosted options: Jitsi Meet, BigBlueButton, Matrix/Synapse, Zulip, and Asterisk all support deployment on organisation-controlled infrastructure. Data never leaves your servers.

Regional cloud options: Element Matrix Services offers EU hosting. BigBlueButton hosted providers offer regional options. Commercial platforms (Teams, Zoom) offer regional data centres but US CLOUD Act exposure remains for US-headquartered vendors.

End-to-end encryption: Matrix provides verifiable E2EE for messaging. Jitsi offers experimental E2EE for video. E2EE prevents vendor access to communication content regardless of server location.

High-risk operating contexts

Organisations operating in hostile environments require additional security considerations:

Reduce metadata exposure: Self-hosted platforms minimise reliance on external services. Matrix federation can be disabled for closed communication.

Verify encryption: Matrix E2EE with cross-signing provides cryptographic verification. Document verification procedures for staff.

Plan for interdiction: Consider what happens if devices are seized. E2EE protects content; device encryption protects local data.

Operational security: Platform selection is one element; complement with secure device management, network security, and staff training.

Migration paths

Resources

Official documentation

Standards references

See also

• Unified Communications
• Video Conferencing Systems
• Voice and Telephony
• Emergency Communications
• Identity and Access Management