VoIP Fundamentals
What Is VoIP and How Does It Work?
Start with the call path, components, protocols, deployment choices and planning requirements.
Read article →VAXVOIP • BLOG
Insights on VoIP, SIP and AI communication
Practical articles for developers, product teams and businesses building SIP servers, softphones, WebRTC applications, IP-PBX platforms and AI voice solutions.
LATEST • ARTICLES
Learn, build and improve your VoIP products
RECENTLY • UPDATED
Recently updated guides
VOIP • FUNDAMENTALS
VoIP fundamentals
Begin with the complete VoIP overview, then explore system architecture, network operations, deployment models and protocols in focused guides.
System Architecture
VoIP System Components and Equipment
Understand call control, endpoints, networks, trunks, gateways and supporting services.
Read article →Operations
VoIP Network Quality, Security and Reliability
Plan latency, jitter, capacity, access control, monitoring and failure recovery.
Read article →Deployment
Hosted vs. On-Premises VoIP
Compare control, integrations, operating responsibilities, resilience and cost scope.
Read article →Protocols
VoIP Protocols: SIP, RTP and Audio Codecs
Separate signaling, media negotiation, packet transport and audio encoding.
Read article →SIP • SERVERS • GATEWAYS
SIP infrastructure and development
Continue with server, trunk, gateway and SDK guidance for implementing SIP communication systems.
SIP Development
What Is a VoIP SIP SDK?
Understand SDKs for softphones, SIP servers, IP-PBX systems and recording applications.
Read article →SIP and VoIP
SIP vs VoIP: What Is the Difference?
See how VoIP transports media while SIP controls communication sessions.
Read article →IP Voice
What Is IP Voice?
Explore internet-based voice calling, its components and common uses.
Read article →SIP Infrastructure
How SIP Servers Place and Manage Calls
Understand registration, signaling, routing and session management.
Read article →SIP Infrastructure
What Is SIP Trunking?
Learn how SIP trunks connect business phone systems with voice providers.
Read article →SIP Gateway
What Is a SIP Gateway for Microsoft Teams?
Understand how gateways connect business telephony and external calling.
Read article →SIP Infrastructure
VoIP SIP Gateway: An Overview
Learn how gateways connect VoIP networks with PSTN and other phone systems.
Read article →SIP • SECURITY • PERFORMANCE
SIP server security and performance
Plan secure, measurable SIP infrastructure before production traffic arrives.
SIP Security
How to Secure a SIP VoIP Server
Apply practical controls against scanning, flooding and brute-force attacks.
Read article →SDK Security
SIP Server SDK Attack Detection Methods
Review exported methods and events for identifying malicious SIP activity.
Read article →Performance
How to Load Test a SIP VoIP Server
Measure registration, call, media and resource performance under controlled load.
Read article →IP-PBX • BUSINESS • TELEPHONY
IP-PBX and business telephony
Move from PBX fundamentals to network design, automation and service selection.
IP-PBX
What Is a PBX Phone System?
Learn how PBX platforms manage extensions, internal calls and external routes.
Read article →IP-PBX
Understanding PBX Phone Systems
Explore core PBX capabilities and common organizational use cases.
Read article →Network Guide
Build a Basic IP-PBX Network
Review the components required to send and receive calls through an IP-PBX.
Read article →Telephony History
The History and Evolution of PBX
Trace PBX systems from operator switching to modern IP platforms.
Read article →Call Automation
What Is an Auto Dialer?
Understand outbound dialing, message delivery, agent routing and IVR workflows.
Read article →Business Telephony
Top 10 Small Business Phone Services for 2026
Compare established services by use case, deployment, integrations and mobility.
Read article →WEBRTC • WEBPHONE
WebRTC and browser calling
Understand browser media, WebPhone architecture and website-to-call-center connectivity.
WebRTC
WebRTC Overview
Learn how browsers provide plugin-free audio, video and data communication.
Read article →Browser Calling
What Is a Webphone?
Discover browser calling, click-to-call and customer communication using WebRTC.
Read article →WebRTC
Connect Website Visitors to a SIP Call Center
See how WebPhone and VaxServerWebRTC connect browsers with SIP infrastructure.
Read article →SIPREC • CALL • RECORDING
Call recording and SIPREC
Review secure recording workflows and media-storage considerations.
AI • VOICE • SPEECH
AI voice and speech systems
Understand AI-driven VoIP, SIP-to-OpenAI voice agents and locally hosted speech-processing architectures.
AI Voice
Connect SIP Server & IP-PBX to an OpenAI Multilingual Smart Agent
Learn how an Agent AI SDK based application bridges SIP infrastructure with an OpenAI multilingual voice agent.
Read article →AI Communication
What Is AI-Driven VoIP?
Explore voice automation, customer service, call analysis and AI workflows.
Read article →AI Communication
Build an On-Premises Speech-to-Speech AI Engine
Review local multilingual voice processing with open-source models and GPU acceleration.
Read article →SDK • DEVELOPMENT • GUIDES
SDK development guides
Use focused implementation guidance when selecting and building communication applications.
DEVELOPER • RESOURCES
Go deeper into SIP security, performance and development
Explore practical guides that help teams design, test and protect commercial VoIP products.
Explore VaxVoIP SDKs