Discover several definitions in the world of VoIP technology

VOIP: this acronym stands for Voice over Internet Protocol or IP telephony; it is a technology that can route voice conversations through the Internet or any other IP network.

SIP: this acronym stands for Session Initiation Protocol, is a protocol that allows to initiate, modify and close an interactive user session that involves multimedia elements such as video, voice, instant messaging, etc.

PBX: this acronym means Private Branch Exchange (private telephone switchboard), different from the telephone switchboard of a service provider.

PABX: this acronym stands for Private Automatic Branch Exchange, (private telephone switchboard), different from the telephone switchboard of a service provider.

IVR: this acronym stands for Interactive Voice Responder, is a computer system that allows the caller to select an option from the voice menu and interact with a system.

DDI: this acronym stands for Direct Inward Dialing.
DID: this acronym stands for Direct Inward Dialing.

It is a function offered by the telephony operator for use with the PBX systems of its customers. This technique allows to communicate with a user of the IPBX, from an external network (for example, from the traditional telephony network) without going through a standard. When someone calls the DID telephone number of the switchboard, this call is identified in the switchboard through an identification service of dialed numbers. The switchboard uses this information to forward the call directly to the SIP phone without the need of an operator or receptionist.

PSTN: this acronym stands for Public Switched Telephone Network, is the concentration of worldwide public telephone networks.

ISDN: this acronym stands for Integrated Services Digital Network, is a switched telephone network that allows the digital transmission of voice and data through normal telephone connections.

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