{"id":40592,"date":"2020-12-10T00:00:00","date_gmt":"2020-12-10T00:00:00","guid":{"rendered":"https:\/\/newrcblog.wpengine.com\/pbx-telephone-service\/"},"modified":"2025-03-13T06:22:05","modified_gmt":"2025-03-13T13:22:05","slug":"what-is-pbx-telephone-service","status":"publish","type":"post","link":"\/us\/en\/blog\/what-is-pbx-telephone-service\/","title":{"rendered":"What is a PBX (private branch exchange) telephone service?"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">PBX (private branch exchange) was revolutionary for its time. It was the diamond jewel of communications systems\u2014the first-ever business phone system for routing and hosting both internal and external calls.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">But that time is long gone.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Today, PBX is an outdated phrase and, for the most part, an outdated system, as more modern and innovative communications systems have taken its place, such as <a class=\"waffle-rich-text-link\" href=\"https:\/\/www.ringcentral.com\/what-is-a-voip-number.html\">VoIP<\/a> (voice over internet protocol) and UCaaS (unified communications as a service). <\/span><\/p>\n<p><span style=\"font-weight: 400;\">So&#8230; you may be thinking that PBX is all but forgotten, but it hasn\u2019t necessarily been kicked to the curb by business owners and leaders.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">With that being said, it has evolved, and in the rest of this article, we\u2019re going to explore the evolution of PBX to learn about its history and various phases.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Why? Because understanding PBX is vital to understanding where we are today, with elite UCaaS providers like <\/span><a href=\"https:\/\/www.ringcentral.com\/office\/how-it-works.html\" target=\"_blank\" rel=\"noopener noreferrer\"><span style=\"font-weight: 400;\">RingCentral<\/span><\/a><span style=\"font-weight: 400;\">. (Yes, we said that, and <\/span><a href=\"https:\/\/www.ringcentral.com\/whyringcentral\/company\/pressreleases\/ringcentral-ranked-highest-in-five-out-of-five-use-cases-in-the-2020-gartner-critical-capabilities-for-unified-communications-as-a-service-worldwide.html\" target=\"_blank\" rel=\"noopener noreferrer\"><span style=\"font-weight: 400;\">we can prove it<\/span><\/a><span style=\"font-weight: 400;\">.)<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Here\u2019s what we\u2019ll cover:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><a href=\"#what\"><span style=\"font-weight: 400;\">What PBX is: An overview\u00a0<\/span><\/a><\/li>\n<li style=\"font-weight: 400;\"><a href=\"#how\"><span style=\"font-weight: 400;\">How a PBX system works\u00a0<\/span><\/a><\/li>\n<li style=\"font-weight: 400;\"><a href=\"#who\"><span style=\"font-weight: 400;\">Who uses PBX systems\u00a0<\/span><\/a><\/li>\n<li style=\"font-weight: 400;\"><a href=\"#evolve\"><span style=\"font-weight: 400;\">How the PBX system has evolved<\/span><\/a><\/li>\n<li style=\"font-weight: 400;\"><a href=\"#diff\"><span style=\"font-weight: 400;\">The differences between PBX, VoIP, and UCaaS<\/span><\/a><\/li>\n<li style=\"font-weight: 400;\"><a href=\"#comp\"><span style=\"font-weight: 400;\">PBX phone system costs: A comparison\u00a0<\/span><\/a><\/li>\n<\/ul>\n<h2><b><a id=\"what\"><\/a><br \/>\nWhat PBX is: An overview<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">A PBX telephone service refers to a private phone network used by a business or organization. It allows users to communicate internally (within their company) and externally (with partners and clients). The telephone system connects calls between users within the PBX on local lines and lets them share a single external phone line through which the company can be contacted. So if you call a company\u2019s phone number and use an extension number to contact Susan in customer service, then you are using that company\u2019s PBX.\u00a0<\/span><\/p>\n<h2><b><a id=\"how\"><\/a><br \/>\nHow a PBX system works<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Several components make up a traditional PBX system.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">The system includes a CPU (central processing unit) that controls call switching, call logging and routing, and connecting and disconnecting.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">A power supply module gives the phone system the power it needs. Its capacity depends on the number of extension lines.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Line cards are used to increase the number of extension lines in the system.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">The operator console controls incoming calls and routes them to the appropriate extension through minimal human intervention.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Trunk lines are the PBX\u2019s way of connecting to lines outside a building.<\/span><\/li>\n<\/ul>\n<h2><b><a id=\"who\"><\/a><br \/>\nWho uses PBX systems<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">The truth is, many companies across all industries use PBX systems (or something similar). Companies thrive on communication, and business isn\u2019t possible without an open line of dialogue. Therefore, it really doesn\u2019t matter whether it\u2019s a law firm, a car dealership, or a pharmaceutical company\u2014each of them requires seamless communication with both internal and external people, and requires a PBX, VoIP, or UCaaS system.\u00a0<\/span><\/p>\n<h2><b><a id=\"evolve\"><\/a><br \/>\nHow the PBX system has evolved<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Back in the day, when someone called a business (aka when a business received an inbound call), a human operator or receptionist from outside the company would need to manually connect the call to the relevant person using cords and a switchboard.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">In the 1960s, the first iterations of PBX were introduced as a way for employees to make calls within their office or connect to others outside of it without having to go through a receptionist. Ultimately, it was a way to reduce costs by making internal and external company phone communications more effective.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">By the 1990s, as the internet and computer technology experienced major advancements, so did telephone systems. After integrating with computers, internet connections were eventually incorporated into telephone systems. Today, PBX systems have a multitude of complex features including call forwarding, voicemail, missed call email notifications, call recording, extension dialing, and mobility.<\/span><\/p>\n<h3><b>The rise of VoIP systems\u00a0<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">As the internet took hold of businesses and their operations in the 1990s, we began to see a merge between communication and the worldwide web.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Not long after, voice over internet protocol, aka VoIP, was born.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">VoIP, in short, is making calls over the internet. It\u2019s the technology that allows people to make voice calls over IP networks in real time, at any time. VoIP is a set of telephony protocols that work through packet switching, which allows digital voice data to travel across different networks like the internet. With this technology, computer networks are able to function similarly to traditional networks and can also be used like a regular landline.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">But VoIP systems alone don\u2019t account for the evolution of PBX, as the rise of instant messaging and its role in business would come along to change the face of business communications forever.\u00a0<\/span><\/p>\n<h3><b>Where we are today: An intro to UCaaS<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">The very seed planted by PBX systems has now grown into something much more vast and varied in its capabilities. That \u201csomething\u201d is referred to as UCaaS, aka unified communications as a service.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">UCaaS is what we provide here at RingCentral.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Unified communications as a service (UCaaS) provides a cloud-based business communications system across multiple channels and devices. UCaaS combines <a href=\"https:\/\/www.ringcentral.com\/internet-phone-service.html\">internet phone service<\/a>, <a href=\"https:\/\/www.ringcentral.com\/us\/en\/blog\/video-conferencing-apps\/\">video conferencing<\/a>, <a href=\"https:\/\/www.ringcentral.com\/us\/en\/blog\/instant-messaging-programs\/\" target=\"_blank\" rel=\"noopener noreferrer\">team messaging<\/a>, SMS, fax, and other communications tools on a single integrated cloud platform. It is designed to be accessed from any device\u2014desktops, laptop\/tablets, or mobile phones<\/span><span style=\"font-weight: 400;\">, and, as you can imagine, greatly helps businesses become more effective and efficient with their communication.\u00a0<\/span><\/p>\n<h2><b><a id=\"diff\"><\/a><br \/>\nThe differences between PBX, VoIP, and UCaaS<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">As you can see, the original PBX business-phone system has undergone quite the transformation over the course of 5+ decades.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">But what does that transformation look like in detail? What are the true differences between PBX, VoIP, and UCaaS? And what do you stand to gain from one that you might not get from another?\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Let\u2019s take a look.\u00a0<\/span><\/p>\n<h3><b>PBX\u00a0<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">A PBX system is compiled of direct-to-line connections that are made possible by an exchange. With a switchboard, a PBX system routes a call until it reaches its target recipient.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Note the word \u201cswitchboard,\u201d which indicates the physical hardware involved in a PBX system\u2014a major difference from VoIP and UCaaS.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">For businesses, the prime advantage of a PBX phone system is that it provides you with the opportunity to have fewer phone lines, as employees can have their own extension numbers with a PBX system. Plus, PBX phone systems allow employees to host their work phones on the same network, making internal calls both easy and free to make.\u00a0<\/span><\/p>\n<h3><b>VoIP<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">A VoIP system, unlike a PBX one, relies on the internet. It works by sending and receiving voice communications over an IP network.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">With a <a href=\"https:\/\/www.ringcentral.com\/office\/features\/voip\/overview.html\">VoIP phone service<\/a>, analog audio like human voice is converted into a digital format that\u2019s transmitted over the internet in real time, mimicking traditional telephone services and calls. In other words, though your verbal conversation is taking place over the internet, it still feels and sounds the same. The means of transporting your voice are just different.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Additionally, VoIP systems are, for the most part nowadays, cloud-based platforms. This means that you don\u2019t have to incur additional hardware costs like servers or PBX systems to host calls. All you need is an internet connection in order to talk shop with both clients and colleagues.\u00a0<\/span><\/p>\n<h3><b>UCaaS<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Where PBX and VoIP systems are applicable for voice-only communications, UCaaS covers all communication channels and devices.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">UCaaS is a cloud-based business communications system that combines phone service, video conferencing, team messaging, SMS, fax, and just about any other communication tool on a single integrated cloud platform:<\/span><\/p>\n<div class=\"rc_custom_video\"><a class=\"rc_custom_video__link\" href=\"https:\/\/www.youtu.be\/9xaL89hYeFs\">\n\t\t            <picture><source srcset=\"https:\/\/i.ytimg.com\/vi_webp\/9xaL89hYeFs\/maxresdefault.webp\" type=\"image\/webp\"><img decoding=\"async\" class=\"rc_custom_video__media\" src=\"https:\/\/i.ytimg.com\/vi\/9xaL89hYeFs\/maxresdefault.jpg\" alt=\"\">\n\t\t            <\/picture>\n\t\t        <\/a><br \/>\n\t\t        <button class=\"rc_custom_video__button\" aria-label=\"Play video\"><svg width=\"68\" height=\"48\" viewBox=\"0 0 68 48\"><path class=\"rc_custom_video__button-shape\" d=\"M66.52,7.74c-0.78-2.93-2.49-5.41-5.42-6.19C55.79,.13,34,0,34,0S12.21,.13,6.9,1.55 C3.97,2.33,2.27,4.81,1.48,7.74C0.06,13.05,0,24,0,24s0.06,10.95,1.48,16.26c0.78,2.93,2.49,5.41,5.42,6.19 C12.21,47.87,34,48,34,48s21.79-0.13,27.1-1.55c2.93-0.78,4.64-3.26,5.42-6.19C67.94,34.95,68,24,68,24S67.94,13.05,66.52,7.74z\"><\/path><path class=\"rc_custom_video__button-icon\" d=\"M 45,24 27,14 27,34\"><\/path><\/svg><br \/>\n\t\t        <\/button>\n\t\t    <\/div>\n<p><span style=\"font-weight: 400;\">Another great feature about a unified-communications-as-a-service system is that it can be accessed from any device connected to it\u2014from desktops to laptops\/tablets and mobile phones.<\/span><\/p>\n<h4><b>The benefits of UCaaS<\/b><\/h4>\n<p><span style=\"font-weight: 400;\">There are several wide-ranging benefits of UCaaS. Not only does a UCaaS system improve productivity and communication efficiencies, but it also boasts serious economic value, flexibility, ease of use, and security.\u00a0<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">It\u2019s more cost-effective<\/span>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">With UCaaS, you don\u2019t have to build or rent additional space for communications hardware, as everything is on the cloud. Plus, you don\u2019t have to hire an IT vendor or team, as the UCaaS provider will service your technology whenever you need them, in addition to whatever maintenance plan you have in place.\u00a0<\/span><\/li>\n<\/ul>\n<\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">It\u2019s scalable<\/span>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">If built to scale globally, your UCaaS system can support you and your team wherever you are across the world. Being cloud-based, it\u2019s incredibly easy to add phone lines and features for new\/traveling employees and new offices:<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\"><a href=\"https:\/\/www.ringcentral.com\/rcapp.html\" target=\"_blank\" rel=\"noopener noreferrer\"><img decoding=\"async\" class=\"alignnone size-full wp-image-42966\" src=\"\/us\/en\/blog\/wp-content\/uploads\/2020\/08\/team-messaging-app-e1606751088883.png\" alt=\"ringcentral team messaging app\" width=\"850\" height=\"494\" \/><\/a>\u00a0<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">It\u2019s easy to use<\/span>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">UCaaS is designed for the modern-day worker and the modern-day company, and it\u2019s especially useful for today\u2019s growing distributed workforces. Mobile-friendly with global capabilities, UCaaS allows you to operate your business smoothly, even with a fully remote workforce scattered around the world.\u00a0<\/span><\/li>\n<\/ul>\n<\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">It\u2019s secure<\/span>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">The best UCaaS providers incorporate network security technologies\u2014in addition to data encryption, HIPAA-compliance, protected file protection, and more\u2014to make sure your company\u2019s data, information, and communications are safe and secure. <a href=\"https:\/\/www.ringcentral.com\/us\/en\/blog\/dental-practice-lockdown-case-study\/\" target=\"_blank\" rel=\"noopener noreferrer\">See how Dentistry for Kids &amp; Adults<\/a> uses a UCaaS platform to provide a great client experience.<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2><b><a id=\"comp\"><\/a><br \/>\nPBX phone system costs: A comparison<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Your investment in a PBX phone system all depends on what you\u2019re looking for in a communications system for your company. It also depends on your bottom line, your budget for the fiscal year, and your cost-cutting goals.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The older, more traditional PBX phone systems come with expensive hardware, while the modern-day cloud-based VoIP systems carry hardly any hardware costs at all. That being said, an investment in a cloud-based system like VoIP should be preceded by a company-wide investment and adoption of the systems needed to successfully host and operate a VoIP system.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Therefore, some of the costs of each tend to offset each other. You\u2019ll pay a higher price for the hardware of the older PBX systems, but you\u2019ll have to make investments in a broader range of technologies for the modern-day VoIP and UCaaS systems. It all comes down to what you\u2019re looking for to help revolutionize your company\u2019s communications.\u00a0<\/span><\/p>\n<h2><b>Prepare your business for the future with RingCentral UCaaS<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Although PBX and VoIP systems are adequate solutions, nothing comes close to the wide-ranging benefits of one of today\u2019s leading UCaaS systems like <\/span><a href=\"https:\/\/www.ringcentral.com\/office\/how-it-works.html\" target=\"_blank\" rel=\"noopener noreferrer\"><span style=\"font-weight: 400;\">RingCentral Office<\/span><\/a><span style=\"font-weight: 400;\">.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Complete with phone, video, and messaging capabilities, RingCentral Office is unified communications like you\u2019ve never seen before. Here are some of the top features of our solution:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">It\u2019s reliable<\/span>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Our industry-leading 99.999% uptime SLA means our carrier-grade infrastructure works day and night to keep you online, all the time.<\/span><\/li>\n<\/ul>\n<\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">It\u2019s global<\/span>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">RingCentral Office allows you to manage teams in over 40 countries from just about anywhere. You also get one bill in your local currency to keep things simple.<\/span><\/li>\n<\/ul>\n<\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">It\u2019s secure<\/span>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">You can protect your data at every level of your business. Plus, our built-in security encrypts conversations between all endpoints.<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>PBX (private branch exchange) was revolutionary for its time. It was the diamond jewel of communications systems\u2014the first-ever business phone system for routing and hosting both internal and external calls.\u00a0 But that time is long gone. Today, PBX is an outdated phrase and, for the most part, an outdated system, as more modern and innovative &#8230;<\/p>\n","protected":false},"author":29,"featured_media":40594,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17901],"tags":[],"class_list":["post-40592","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-business-leadership"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v19.3 (Yoast SEO v27.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>What is a PBX (private branch exchange) telephone service? | RingCentral Blog<\/title>\n<meta name=\"description\" content=\"PBX is a term of the past, but knowing what it is and how it\u2019s evolved is critical in understanding the best communications systems of today.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ringcentral.com\/us\/en\/blog\/what-is-pbx-telephone-service\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What is a PBX (private branch exchange) telephone service?\" \/>\n<meta property=\"og:description\" content=\"PBX is a term of the past, but knowing what it is and how it\u2019s evolved is critical in understanding the best communications systems of today.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.ringcentral.com\/us\/en\/blog\/what-is-pbx-telephone-service\/\" \/>\n<meta property=\"og:site_name\" content=\"RingCentral Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/ringcentral\" \/>\n<meta property=\"article:published_time\" content=\"2020-12-10T00:00:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-03-13T13:22:05+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.ringcentral.com\/us\/en\/blog\/wp-content\/uploads\/2020\/07\/image-1.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1000\" \/>\n\t<meta property=\"og:image:height\" content=\"667\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"RingCentral Team\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@ringcentral\" \/>\n<meta name=\"twitter:site\" content=\"@ringcentral\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"RingCentral Team\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"9 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/what-is-pbx-telephone-service\/#article\",\"isPartOf\":{\"@id\":\"\/us\/en\/blog\/what-is-pbx-telephone-service\/\"},\"author\":{\"name\":\"RingCentral Team\",\"@id\":\"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/#\/schema\/person\/65a168321317ffd562e0d77745f1b358\"},\"headline\":\"What is a PBX (private branch exchange) telephone service?\",\"datePublished\":\"2020-12-10T00:00:00+00:00\",\"dateModified\":\"2025-03-13T13:22:05+00:00\",\"mainEntityOfPage\":{\"@id\":\"\/us\/en\/blog\/what-is-pbx-telephone-service\/\"},\"wordCount\":1825,\"publisher\":{\"@id\":\"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/#organization\"},\"image\":{\"@id\":\"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/what-is-pbx-telephone-service\/#primaryimage\"},\"thumbnailUrl\":\"\/us\/en\/blog\/wp-content\/uploads\/2020\/07\/image-1.jpg\",\"articleSection\":[\"Business &amp; leadership\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"\/us\/en\/blog\/what-is-pbx-telephone-service\/\",\"url\":\"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/what-is-pbx-telephone-service\/\",\"name\":\"What is a PBX (private branch exchange) telephone service? | RingCentral Blog\",\"isPartOf\":{\"@id\":\"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/what-is-pbx-telephone-service\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/what-is-pbx-telephone-service\/#primaryimage\"},\"thumbnailUrl\":\"\/us\/en\/blog\/wp-content\/uploads\/2020\/07\/image-1.jpg\",\"datePublished\":\"2020-12-10T00:00:00+00:00\",\"dateModified\":\"2025-03-13T13:22:05+00:00\",\"description\":\"PBX is a term of the past, but knowing what it is and how it\u2019s evolved is critical in understanding the best communications systems of today.\",\"breadcrumb\":{\"@id\":\"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/what-is-pbx-telephone-service\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/what-is-pbx-telephone-service\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/what-is-pbx-telephone-service\/#primaryimage\",\"url\":\"\/us\/en\/blog\/wp-content\/uploads\/2020\/07\/image-1.jpg\",\"contentUrl\":\"\/us\/en\/blog\/wp-content\/uploads\/2020\/07\/image-1.jpg\",\"width\":1000,\"height\":667},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/what-is-pbx-telephone-service\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"\/us\/en\/blog\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"What is a PBX (private branch exchange) telephone service?\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/#website\",\"url\":\"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/\",\"name\":\"RingCentral Blog\",\"description\":\"Intelligent Communications\",\"publisher\":{\"@id\":\"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/#organization\",\"name\":\"RingCentral\",\"url\":\"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/#\/schema\/logo\/image\/\",\"url\":\"\/us\/en\/blog\/wp-content\/uploads\/2025\/04\/ringcentral-logo.png\",\"contentUrl\":\"\/us\/en\/blog\/wp-content\/uploads\/2025\/04\/ringcentral-logo.png\",\"width\":2048,\"height\":309,\"caption\":\"RingCentral\"},\"image\":{\"@id\":\"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/#\/schema\/logo\/image\/\"},\"sameAs\":[\"https:\/\/www.facebook.com\/ringcentral\",\"https:\/\/x.com\/ringcentral\",\"https:\/\/www.linkedin.com\/company\/ringcentral\/\",\"https:\/\/www.instagram.com\/ringcentral\"]},{\"@type\":\"Person\",\"@id\":\"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/#\/schema\/person\/65a168321317ffd562e0d77745f1b358\",\"name\":\"RingCentral Team\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/secure.gravatar.com\/avatar\/9a8d989fa7e72af5bd5cf487cf7080318b695de4be89de382c5e64305dd0249c?s=96&d=mm&r=g\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/9a8d989fa7e72af5bd5cf487cf7080318b695de4be89de382c5e64305dd0249c?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/9a8d989fa7e72af5bd5cf487cf7080318b695de4be89de382c5e64305dd0249c?s=96&d=mm&r=g\",\"caption\":\"RingCentral Team\"},\"sameAs\":[\"https:\/\/www.ringcentral.com\"],\"url\":\"\/us\/en\/blog\/author\/ringcentral-team\/\"}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"What is a PBX (private branch exchange) telephone service? | RingCentral Blog","description":"PBX is a term of the past, but knowing what it is and how it\u2019s evolved is critical in understanding the best communications systems of today.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.ringcentral.com\/us\/en\/blog\/what-is-pbx-telephone-service\/","og_locale":"en_US","og_type":"article","og_title":"What is a PBX (private branch exchange) telephone service?","og_description":"PBX is a term of the past, but knowing what it is and how it\u2019s evolved is critical in understanding the best communications systems of today.","og_url":"https:\/\/www.ringcentral.com\/us\/en\/blog\/what-is-pbx-telephone-service\/","og_site_name":"RingCentral Blog","article_publisher":"https:\/\/www.facebook.com\/ringcentral","article_published_time":"2020-12-10T00:00:00+00:00","article_modified_time":"2025-03-13T13:22:05+00:00","og_image":[{"width":1000,"height":667,"url":"https:\/\/www.ringcentral.com\/us\/en\/blog\/wp-content\/uploads\/2020\/07\/image-1.jpg","type":"image\/jpeg"}],"author":"RingCentral Team","twitter_card":"summary_large_image","twitter_creator":"@ringcentral","twitter_site":"@ringcentral","twitter_misc":{"Written by":"RingCentral Team","Est. reading time":"9 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/what-is-pbx-telephone-service\/#article","isPartOf":{"@id":"\/us\/en\/blog\/what-is-pbx-telephone-service\/"},"author":{"name":"RingCentral Team","@id":"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/#\/schema\/person\/65a168321317ffd562e0d77745f1b358"},"headline":"What is a PBX (private branch exchange) telephone service?","datePublished":"2020-12-10T00:00:00+00:00","dateModified":"2025-03-13T13:22:05+00:00","mainEntityOfPage":{"@id":"\/us\/en\/blog\/what-is-pbx-telephone-service\/"},"wordCount":1825,"publisher":{"@id":"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/#organization"},"image":{"@id":"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/what-is-pbx-telephone-service\/#primaryimage"},"thumbnailUrl":"\/us\/en\/blog\/wp-content\/uploads\/2020\/07\/image-1.jpg","articleSection":["Business &amp; leadership"],"inLanguage":"en-US"},{"@type":"WebPage","@id":"\/us\/en\/blog\/what-is-pbx-telephone-service\/","url":"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/what-is-pbx-telephone-service\/","name":"What is a PBX (private branch exchange) telephone service? | RingCentral Blog","isPartOf":{"@id":"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/#website"},"primaryImageOfPage":{"@id":"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/what-is-pbx-telephone-service\/#primaryimage"},"image":{"@id":"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/what-is-pbx-telephone-service\/#primaryimage"},"thumbnailUrl":"\/us\/en\/blog\/wp-content\/uploads\/2020\/07\/image-1.jpg","datePublished":"2020-12-10T00:00:00+00:00","dateModified":"2025-03-13T13:22:05+00:00","description":"PBX is a term of the past, but knowing what it is and how it\u2019s evolved is critical in understanding the best communications systems of today.","breadcrumb":{"@id":"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/what-is-pbx-telephone-service\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/what-is-pbx-telephone-service\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/what-is-pbx-telephone-service\/#primaryimage","url":"\/us\/en\/blog\/wp-content\/uploads\/2020\/07\/image-1.jpg","contentUrl":"\/us\/en\/blog\/wp-content\/uploads\/2020\/07\/image-1.jpg","width":1000,"height":667},{"@type":"BreadcrumbList","@id":"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/what-is-pbx-telephone-service\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"\/us\/en\/blog\/"},{"@type":"ListItem","position":2,"name":"What is a PBX (private branch exchange) telephone service?"}]},{"@type":"WebSite","@id":"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/#website","url":"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/","name":"RingCentral Blog","description":"Intelligent Communications","publisher":{"@id":"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/#organization","name":"RingCentral","url":"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/#\/schema\/logo\/image\/","url":"\/us\/en\/blog\/wp-content\/uploads\/2025\/04\/ringcentral-logo.png","contentUrl":"\/us\/en\/blog\/wp-content\/uploads\/2025\/04\/ringcentral-logo.png","width":2048,"height":309,"caption":"RingCentral"},"image":{"@id":"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/www.facebook.com\/ringcentral","https:\/\/x.com\/ringcentral","https:\/\/www.linkedin.com\/company\/ringcentral\/","https:\/\/www.instagram.com\/ringcentral"]},{"@type":"Person","@id":"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/#\/schema\/person\/65a168321317ffd562e0d77745f1b358","name":"RingCentral Team","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/secure.gravatar.com\/avatar\/9a8d989fa7e72af5bd5cf487cf7080318b695de4be89de382c5e64305dd0249c?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/9a8d989fa7e72af5bd5cf487cf7080318b695de4be89de382c5e64305dd0249c?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/9a8d989fa7e72af5bd5cf487cf7080318b695de4be89de382c5e64305dd0249c?s=96&d=mm&r=g","caption":"RingCentral Team"},"sameAs":["https:\/\/www.ringcentral.com"],"url":"\/us\/en\/blog\/author\/ringcentral-team\/"}]}},"rc_img_url":"\/us\/en\/blog\/wp-content\/uploads\/2020\/07\/image-1.jpg","rcblog_by_author":"<a href=\"\/us\/en\/blog\/author\/ringcentral-team\/amp\" data-dl-events-click=\"true\" data-dl-element=\"link\"><span class=\"image\"><img src=\"https:\/\/secure.gravatar.com\/avatar\/9a8d989fa7e72af5bd5cf487cf7080318b695de4be89de382c5e64305dd0249c?s=96&d=mm&r=g\" alt=\"\" width=\"30\" height=\"30\" layout=\"fixed\"><\/img><\/span><span class=\"by-author-name\">RingCentral Team<\/span><\/a>","rc_author_full_name":"RingCentral Team","rc_author_avatar":"\/us\/en\/blog\/wp-content\/uploads\/2022\/02\/ringcentral-logo-new.png","rc_author_link":"\/us\/en\/blog\/author\/ringcentral-team\/amp","rc_post_categories":"<a href=\"\/us\/en\/blog\/category\/trending\/business-leadership\/amp\">Business &amp; leadership<\/a>","amp_link":"\/us\/en\/blog\/what-is-pbx-telephone-service\/amp","excerpt_title":"What is a PBX (private branch exchange) telephone service?","_links":{"self":[{"href":"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/wp-json\/wp\/v2\/posts\/40592","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/wp-json\/wp\/v2\/users\/29"}],"replies":[{"embeddable":true,"href":"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/wp-json\/wp\/v2\/comments?post=40592"}],"version-history":[{"count":0,"href":"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/wp-json\/wp\/v2\/posts\/40592\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/wp-json\/wp\/v2\/media\/40594"}],"wp:attachment":[{"href":"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/wp-json\/wp\/v2\/media?parent=40592"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/wp-json\/wp\/v2\/categories?post=40592"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/newrcblog.wpengine.com\/us\/en\/blog\/wp-json\/wp\/v2\/tags?post=40592"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}