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| Definition: private branch exchange (PBX) | | A private branch exchange (PBX) is a telephone system within an enterprise that switches calls between users on local lines, while enabling all users to share a certain number of external phone lines. | | |
| Definition: cloud telephony (cloud calling) | | Cloud telephony, also known as cloud calling, is a type of unified communications as a service (UCaaS) that offers voice communication services through a third-party host. | | |
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