Back in the day, most businesses had an in-house PBX system connected to the public switched telephone network (“PSTN”), operated by a manual or automatic switching system. Then came the Internet and digital communications. The in-house PBX was connected to the PSTN and the Internet using a SIP Trunk.
Strictly speaking, SIP Trunks were not necessary since a PBX could connect using standard landlines. However, a SIP Trunk could provide additional functionality such as call forwarding. Then came VoIP, connecting a digital phone system running on an internal corporate network to the Internet, again often over a SIP Trunk.
Over the last few years, businesses have been steadily embracing remote access to their systems, either supporting working from home or remote access to eCommerce systems. This is often in addition to implementing VoIP systems to accrue their costs and operational benefits.
Other remote access systems used increasingly over the last few years have been collaborative communications systems, both free-standing and supporting integrated voice and videoconferencing, like Messenger, Zoom, and NetMeeting.
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