4 types of telephony systems for the enterprise

4 types of telephony systems for the enterprise
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Legacy, circuit-switched PBX. In traditional phone systems, on-premises private branch exchange (PBX) boxes act as in-house switching centers, connecting calls between internal devices directly and routing external calls to and from the PSTN via dedicated trunk lines. Human operators managed the earliest PBX systems but were eventually replaced by modern automated attendants.
While expensive and complex — and more or less obsolete — legacy PBX systems have historically been most attractive in areas with unreliable network connectivity or electrical power. (Some hard-wired phone lines continue to work even in the event of electrical outages.)
VoIP PBX. Similar to the traditional PBX, a VoIP or IP PBX essentially creates a private phone network within a business but does so via the internet or a private local area network (LAN) rather than dedicated voice circuits.
Because it doesn’t require a separately wired network and doesn’t rely on the PSTN — with its long-distance charges — internet telephony is significantly less expensive than legacy PBX systems. It also offers more geographic flexibility to users, as they can access softphone applications across their devices, rather than staying tethered to desk handsets.
On-premises IP PBX telephony systems consist of software running on servers. An on-site IP PBX typically offers more sophisticated feature sets and greater reliability than a cloud-based VoIP service (see below), but it is also more expensive and complex to deploy, manage and maintain.
Hybrid PBX. Some organizations deploy a hybrid PBX model that uses both legacy and IP Telephony PBX PBA Doha Qatar technology — whether for redundancy, cost savings or to enable a staged migration to VoIP. These environments use gateways to bridge VoIP and PSTN functionality.
Alternatively, some use the term hybrid PBX to refer to a VoIP Telephony PBX PBA Doha Qatar system with both on-premises and cloud-hosted resources.
Cloud VoIP. Cloud VoIP, also known as cloud telephony or cloud calling, is a VoIP service provided by a third party. By outsourcing its system, an enterprise can eliminate the need to provision, manage and maintain an on-site IP PBX, reducing infrastructure costs and increasing scalability. Features, functionality and controls tend to be less comprehensive than on-premises options, although many analysts expect that difference to shrink with time.

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