Codec is short for encoder/decoder where you digitally compress and decompress sound. It is a process where you reduce the file size to achieve a faster transfer online. When it refers to calls over the internet, it means that the voice (the audio signal) is being digitally compressed. When the audio signal reaches the final destination, it is decompressed so it can be played in full quality. That is how VoIP is made possible.
DID (Direct Inward Dial)
SIP trunking uses DID (Direct Inward Dial). That means everyone at the office can have their own SIP line. To be able to use DID, you need to use ISDN or another digital connection. DID is a function that gives all employees their own phone numbers without having to use a dedicated telephone line for this.
DSL (Digital Subscriber Line)
Another method for connecting to the internet by using telephone lines. Like ISDN, speech and data can be transferred simultaneously.
IDSN (Integrated Services Digital Network)
A common method for connecting to the internet over regular phone lines. A technology developed during the 1980s. Since the network is digital, you can use several units at the same time, like telephones and computers.
IP (Internet Protocol)
IP telephony means you call over the internet instead of the traditional fixed telephone network. IP is the communication protocol that is used to send information over the internet.
PSTN (Public Switched Telephone Network)
The analogue traditional telephone network, consisting of copper wires.
QoS (Quality of Service)
QoS is a router setting asking the network to prioritise voice calls to avoid disturbances and lost quality. With the QoS setting, you always keep the sound quality – even when doing data-consuming activities such as streaming video or downloading large files.
SIP (Session Initiated Protocol)
SIP is the protocol being used to send voice data over the internet. A SIP trunk enables online calls, i.e., streamed calls instead of the traditional telephony over the fixed network.
Either hard- or software phones that use VoIP for calls. Another name for VoIP phones or softphones.
A softphone is software you install on your computer or tablet to be able to use the unit as a regular phone. It is most often used in conjunction with VoIP to make calls over the internet.
UCaaS (Unified Communications as a Service)
UCaaS means to subscribe to (most commonly) cloud-based solutions for Unified Communications. For example, a basic version of UCaaS can gather the company’s telephony, chat, PBX, email, and video calls in one platform.
VoIP (Voice over Internet Protocol)
A technology or concept for voice calls over the internet. It is sometimes called IP telephony, broadband telephony, and internet telephony.