VoIP & Cloud PBX Glossary

An employee whose primary role is to handle incoming or outgoing customer communications on behalf of the business, whether in a call centre or customer service environment. Agents use phones, softphones, and other communication tools to interact with customers and resolve inquiries.

A person responsible for answering incoming calls, managing the switchboard, and transferring calls to appropriate extensions or departments. In modern cloud PBX environments, automated attendants (auto-attendants) have replaced many human attendants, though larger organizations still employ attendants for premium customer experience or complex call routing requirements.

An automated system that answers incoming calls and routes them to the appropriate department or person based on the caller's input (typically through a menu system). Instead of hiring a receptionist to answer every call, an auto-attendant uses pre-recorded messages and touch-tone inputs to intelligently direct calls.

The maximum amount of data that can be transmitted over your internet connection in a given time period, typically measured in megabits per second (Mbps). VoIP quality depends heavily on having sufficient bandwidth available—a single voice call typically requires 64 kbps to 128 kbps of bandwidth.

A centralized facility where teams of agents handle incoming or outgoing customer communications across voice, email, chat, and other channels. Modern cloud-based call centres can route calls intelligently across multiple locations, enable remote agents, and provide real-time reporting on performance metrics.

The ability to automatically redirect incoming calls from one phone number to another number (such as a mobile phone, another office, or a colleague's extension). Call forwarding can be conditional, allowing you to set rules such as "forward calls after hours to my mobile" or "forward calls if I'm unavailable within three rings." This feature is invaluable for South African businesses with…

A feature that allows an agent to place a call on hold in a shared "parking slot" (a numbered orbit) so that any other phone on the system can retrieve it. For example, a customer service agent can park a call on slot 71, announce it to the team, and a more specialized colleague can dial *71 from their extension to pick up the call—without requiring the customer to hang up and call back.

A holding area where incoming calls wait in line to be answered by the next available agent. The system manages the order of calls and may provide the caller with a message indicating their position in the queue or estimated wait time. Call queues are fundamental to call centre operations, and modern systems include features like callback options to prevent caller abandonment.

The ability to capture and store audio recordings of phone conversations for quality assurance, training, compliance, and dispute resolution purposes. Call recording must be implemented carefully in South Africa to comply with POPIA regulations, which generally require the consent of all parties to a call before recording.

The intelligent process of directing an incoming call to the most appropriate destination based on factors such as the caller's number, the dialled number, the time of day, the availability of agents, and pre-programmed rules. Sophisticated call routing ensures that customers reach the right department quickly, improving customer satisfaction and operational efficiency.

A feature that allows a caller to request a return call instead of waiting in a queue. Rather than remaining on hold during a long wait, the caller enters their number and the system automatically calls them back when an agent becomes available. For South African call centres, callback functionality reduces caller abandonment, improves customer satisfaction, and makes better use of agent time.

A cloud-based software solution that provides all the tools needed to operate a contact centre, including call handling, multi-channel communications, workforce management, and analytics. Rather than purchasing and maintaining expensive on-premise equipment, businesses subscribe to a CCaaS platform and access it via the internet.

A detailed log of every phone call made through your system, recording information such as the caller's number, recipient's number, call duration, time of call, and the outcome. CDRs are essential for billing accuracy, regulatory compliance (particularly for POPIA), and analyzing communication patterns.

A PBX system delivered as a service over the internet — no on-site hardware needed. Euphoria's Cloud PBX combines powerful calling features with local and long-distance services.

Software that compresses and decompresses voice data to reduce bandwidth requirements while maintaining acceptable quality. Common codecs include G.711, G.729, and Opus, each offering different trade-offs between quality and bandwidth consumption. Understanding codecs is important when optimizing VoIP performance on limited bandwidth connections.

A virtual meeting room that connects multiple people over a phone line or internet connection for conference calls. No special equipment needed — just dial in.

The connection between your telephony system and your Customer Relationship Management software, allowing call data, caller information, and interaction history to flow seamlessly between systems. When a customer calls, their details automatically appear on the agent's screen, enabling personalized service without the customer needing to repeat information.

The practices and technologies used to protect sensitive information from unauthorized access, theft, or misuse. In the context of VoIP and cloud communications, data security includes encryption of voice calls, secure storage of call recordings, and protection against eavesdropping.

A set of rules that automatically assigns IP addresses to devices on your network. When you plug in a phone or computer, DHCP gives it an address so it can communicate on the network.

Also called Direct Dialling In, a DID number is a unique phone number that routes directly to a specific extension on your system without requiring the caller to navigate through an auto-attendant or receptionist. A business can have multiple DID numbers pointing to different departments or individuals.

Plans and systems designed to ensure business operations can continue or resume quickly after an unexpected disruptive event, such as natural disasters, network failures, or data centre outages. Cloud PBX systems inherently provide disaster recovery capabilities through geographic redundancy and automatic failover.

A network area that sits between your internal network and the internet. The DMZ typically hosts publicly accessible services like web servers and email servers while keeping your internal network protected.

A phone setting that forwards all incoming calls straight to voicemail so your phone never rings. Useful when you're in meetings or need focused work time.

The tones generated when you press buttons on a phone keypad. DTMF signalling is used for telephone signalling over the voice-frequency band to the call-switching centre.

The international standard format for phone numbers, ensuring that calls can be routed correctly across global networks. E.164 numbers include the country code (such as +27 for South Africa), the area code, and the local number, written as +27-11-555-0100 (though the hyphens are optional in technical systems).

A short number (typically 3 to 5 digits) that identifies a specific phone, user, or department within your telephone system. Extensions allow internal calls to be routed quickly without dialling external numbers. For example, extension 102 might reach the sales department, while extension 205 reaches accounting.

The process of dialling an extension number to reach a specific person or department within an organization's phone system. Extension dialling is faster than dialling full phone numbers and is essential for efficient internal communications. Modern cloud PBX systems support thousands of extensions, allowing businesses to scale without increasing the complexity of dialling.

The automatic switching of critical functions to a backup system when the primary system fails. In telephony, failover ensures that if your primary internet connection drops or your main data centre becomes unavailable, calls continue to be routed correctly to backup systems.

High-speed internet connectivity delivered through fibre optic cables, offering significantly greater bandwidth and reliability compared to traditional copper-based connections. South Africa's fibre infrastructure, provided by companies like Frogfoot Networks and Vumatel, has dramatically improved in recent years, enabling businesses to reliably support cloud communications.

The integration of fixed-line telephony (traditional office phones) and mobile phone communications into a single unified system. With fixed mobile convergence, a business number can ring on both your office phone and mobile device simultaneously, and you can transfer calls seamlessly between devices.

A call hunting feature that lets you enter up to five phone numbers to ring in sequence. If you don't answer at your desk, it tries your mobile, then your home office, and so on.

A widely used audio codec (compression format) for VoIP that provides high-quality voice reproduction at the cost of requiring higher bandwidth (approximately 64 kbps per call). G.711 is the industry standard and is supported by virtually all VoIP systems and devices.

The most efficient codec for transporting voice over low-bandwidth networks, commonly used across South Africa. G.729 compresses voice data to use minimal bandwidth while maintaining call quality.

An intelligent call routing feature that directs calls to the nearest physical location or appropriate service centre based on the caller's location. For South African businesses with multiple offices across different provinces, geolocation routing ensures customers connect with local teams, improving response times and reducing costs.

A flexible work arrangement where employees don't have assigned permanent desks or phones but instead use shared workspaces and equipment on a first-come, first-served basis. In a cloud PBX environment, hot desking works seamlessly—employees log into any available phone or computer, and their extension and settings follow them automatically.

A collection of extensions that are dialled as a single group, with incoming calls automatically distributed among available group members in a predetermined sequence. For example, if you dial the hunt group number 101, the system checks extension 201, then 202, then 203, routing the call to the first person available.

A call routing feature that rings extensions one at a time in sequence until someone answers. Unlike a ring group (which rings everyone at once), a hunt list tries each person in order — and can even hunt through multiple ring groups.

Real-time text-based communication between users, allowing quick exchanges without the overhead of phone calls or emails. Instant messaging is often integrated into unified communications platforms, allowing users to check presence before calling and switch seamlessly between messaging and voice.

The fundamental addressing system of the internet. Every device connected to the internet has an IP address — it's how data knows where to go.

A telephone device that connects to your data network (Ethernet or WiFi) and uses internet protocols to transmit calls rather than traditional phone lines. IP phones look and function like regular phones but are powered by VoIP technology. Modern IP phones offer high-quality audio, support for colour screens, programmable buttons for quick dialling, and integration with business applications.

An automated phone menu that greets callers and directs them to the right person or department — "Press 1 for Sales, Press 2 for Support." Replaces the need for a receptionist. Also known as a Digital Receptionist or Auto Attendant (AA).

The variation in delay time between data packets traveling across a network. While some latency (delay) is tolerable in voice calls, jitter causes voice quality to degrade noticeably—speakers sound choppy or words become difficult to understand. Network jitter is often caused by congestion, inadequate QoS settings, or unstable internet connections.

A network covering a small area like a home, office, or building. Your office network where all the computers and phones are connected is a LAN.

The time delay that occurs when data travels from your phone to the recipient's phone across the network. While modern networks are fast, latency becomes noticeable when it exceeds 150 milliseconds, creating an awkward "walkie-talkie" effect where both speakers talk over each other. Most quality internet connections maintain latency below 50 milliseconds.

The ability to transfer your existing telephone number from one phone service provider to another. In South Africa, LNP lets you keep your number when switching to Euphoria.

The ability of your telephony system to continue operating during periods when electricity is cut by utility providers, a particular concern in South Africa. Load shedding resilience is achieved through battery backup systems (UPS), backup internet connections, and cloud-based systems that aren't dependent on local power infrastructure.

A feature that rings your VoIP number and a standard phone number (or any other numbers) simultaneously when you receive a call. Ensures you're reachable on any device.

A numerical rating (typically 1 to 5, where 5 is best) that measures perceived voice quality in VoIP calls. MOS scores are calculated automatically by measuring latency, jitter, packet loss, and codec quality, or collected through user surveys asking people to rate call quality. An MOS score of 4.0 or higher is considered good quality for business communications.

A router feature that lets multiple devices on a private network share a single public IP address to access the internet. NAT rewrites IP packet addresses as they pass through the router.

The process of transferring an existing phone number from one provider to another without losing the number itself. Number porting preserves your business identity and customer relationships—customers continue reaching you on the familiar number. In South Africa, number porting is regulated by ICASA (the Independent Communications Authority) and typically takes 2-4 weeks to complete.

A communication strategy where customers can reach your business through multiple channels—voice, SMS, email, chat, social media—and their conversation history is maintained across all channels. If a customer calls, then texts you later, the agent can see the full conversation history. Omnichannel provides superior customer experience and more complete customer context.

A traditional Private Branch Exchange system that is physically installed and maintained in your office rather than hosted in the cloud. On-premise PBX requires capital investment in hardware, ongoing maintenance, software upgrades, and staff expertise to manage.

A feature that lets you specify up to four phone numbers to ring simultaneously when someone calls your main number. Ensures you never miss a call regardless of which device you're near.

The percentage of data packets transmitted across the network that fail to reach their destination. While the internet automatically resends lost packets, packet loss in VoIP causes voice quality degradation because real-time voice data cannot be recovered in time. Packet loss above 1 percent becomes noticeable to users.

A private phone system that switches calls between VoIP users on local lines while allowing all users to share a set of external phone lines. An IP PBX handles this over internet protocol.

Compliance with South Africa's Protection of Personal Information Act, which regulates how businesses collect, use, store, and protect personal data, including phone numbers and call recordings. POPIA requires explicit consent before recording calls, secure storage of sensitive information, and procedures for customers to access or delete their data.

A network protocol commonly used by South African ISPs to manage broadband connections. PPPoE handles authentication and connection management between your router and your internet provider.

The ability to display your real-time availability status (available, in a call, in a meeting, away, offline) to colleagues and customers. Presence management integrates across all your communication devices—when you're on a call on your IP phone, your softphone shows "In a Call," preventing colleagues from trying to reach you.

Network settings that prioritise voice traffic over other data to ensure clear, uninterrupted calls. QoS mechanisms assign different priority levels to different types of data flowing through your network.

Systematic processes used to monitor, evaluate, and improve the quality of customer communications and agent performance. Quality assurance typically involves call recording, listening, scoring against quality standards, and providing feedback to agents.

A trained professional responsible for managing incoming calls, greeting visitors, and directing communications to appropriate staff members. While many organizations use automated attendants for initial call handling, receptionists remain valuable for larger organizations seeking premium customer experience or specialized routing needs. See also: Auto-Attendant, Call Routing, Attendant

A set of extensions that share incoming calls. For example, your sales team can all be in one ring group so any available person can answer. All phones in the group ring at the same time.

The smaller phone jack used to connect traditional telephone cables. You'll recognise it as the plug on your landline phone cord — narrower than a network cable plug.

The standard network cable connector used for ethernet connections. It's the wider plug on your network cable that connects computers, IP phones, and other devices to your network.

The standardised packet format for delivering audio and video over the internet. RTP is what actually carries the voice data during a VoIP call.

A network appliance that controls the flow of VoIP calls between different networks, acting as a security gateway and traffic manager. An SBC sits between your internal phone system and the internet, protecting your system from attacks, managing bandwidth, and translating between different VoIP protocols.

The signalling protocol that sets up, maintains, and ends VoIP calls. SIP is an application-layer control protocol used for creating and managing voice sessions — almost all internet voice activity relies on it.

A virtual "phone line" that connects your on-premise or cloud PBX system to the public telephone network via the internet, replacing traditional analog phone lines. A single SIP trunk can carry multiple simultaneous calls, and businesses can add additional trunks to increase capacity.

An intelligent call routing system that analyzes customer needs and directs calls to agents with specific skills or expertise rather than simply distributing calls evenly. For example, a customer inquiring about business banking is routed to an agent trained in business services rather than consumer banking. Skill-based routing improves first-contact resolution rates and customer satisfaction.

A contract between a service provider and customer that specifies performance guarantees, such as "answer 95 percent of calls within 20 seconds" or "maintain 99.9 percent system uptime." SLAs are critical in call centre operations and telecommunications services.

A protocol used for transmitting SMS messages across telecommunications networks. While primarily used for SMS, SMPP integration allows cloud communications platforms to offer unified messaging across voice and text channels. For South African businesses integrating SMS with voice communications, SMPP ensures reliable message delivery. See also: SMS, Omnichannel, Communication Channels

A software application that runs on your computer or mobile device and functions as a phone, allowing you to make and receive calls using your business number. Softphones eliminate the need for dedicated desk phones—employees can use their laptops or smartphones to stay connected.

The fundamental set of communications protocols that powers the internet and most commercial networks. TCP handles reliable data delivery while IP handles addressing and routing.

Processes and features that automatically adjust call routing, scheduling, and availability based on time zones, enabling 24/7 support without requiring staff to work around-the-clock. For South African businesses serving global customers or managing teams across international time zones, time zone management ensures calls are routed to available staff and schedules respect working hours across…

A cloud-based platform that combines multiple communication tools—voice, video, messaging, file sharing, presence management—into a single integrated system. Rather than managing separate systems for email, video conferencing, instant messaging, and voice, UCaaS provides a unified experience.

An integrated approach to business communications that combines voice, video, instant messaging, presence, and collaboration tools into a single platform, ensuring seamless communication regardless of the medium. Rather than using separate systems for different communication types, unified communications creates a unified experience where conversation history is maintained across channels.

A set of protocols that lets devices on your network discover and connect to each other automatically. UPnP simplifies setting up devices like IP phones — just plug them in and they configure themselves.

The percentage of time a system is operational and available for use, typically expressed as "99.9 percent uptime" (meaning the system is unavailable for a maximum of approximately 8.76 hours per year). For business-critical systems like VoIP, high uptime guarantees are essential.

Real-time video and audio communication between multiple participants in different locations, allowing face-to-face meetings without travel. Modern cloud PBX platforms often integrate video conferencing capabilities, enabling businesses to transition seamlessly from voice to video calls.

The subjective perception of clarity and naturalness in voice calls, determined by factors including latency, jitter, packet loss, and codec selection. Voice quality is measured objectively using metrics like MOS (Mean Opinion Score) and subjectively through user surveys. Maintaining excellent voice quality requires adequate bandwidth, proper network configuration, and quality service providers.

A feature that automatically transcribes voicemail messages and delivers them as email attachments or text transcripts to your inbox. This allows you to read, listen to, and prioritize voicemails within your existing email workflow. For South African professionals managing high-volume communications, voicemail to email ensures you don't miss important messages, and text transcripts allow quick…

Making phone calls over the internet instead of traditional copper phone lines. VoIP routes voice conversations through any IP-based network, also known as IP Telephony or Broadband Phone.

A secure, encrypted tunnel over the internet that lets you communicate privately. Businesses use VPNs to safely connect remote offices and employees as if they were on the same local network.

A real-time display (physical or digital) that shows the current status of a call centre, including the number of calls in queue, average wait times, number of available agents, and performance metrics. Wallboards are mounted in call centre environments and provide supervisors and agents with immediate visibility into operational performance.

A network that covers a broad geographic area — across cities, regions, or countries. The internet is the largest WAN. Businesses use WANs to connect offices in different locations.

A technology that enables voice, video, and messaging capabilities directly within web browsers without requiring users to download software or apps. WebRTC allows businesses to embed calling capabilities into their websites—customers can click "call us" and connect directly with support staff.

A set of tools and processes that optimize the allocation of staff to match customer demand, typically in contact centres. WFM systems forecast call volumes, schedule staff accordingly, track productivity, and monitor adherence to schedules. Modern WFM tools include forecasting, scheduling, performance analytics, and quality monitoring.

The official WhatsApp API that enables businesses to send and receive messages at scale through WhatsApp's messaging platform, which is used by the majority of smartphone users in South Africa. Integration with WhatsApp Business API allows businesses to offer customer support, send notifications, and maintain conversations through a channel that customers already use.

The ability to make and receive calls using your business phone number over WiFi rather than cellular networks or fixed internet. WiFi calling is particularly valuable in areas with poor cellular coverage or where cellular data is expensive. For South African businesses with employees in rural areas or offices with poor signal strength, WiFi calling ensures communication remains reliable without…