PBX, yofupikitsidwa ku Private Branch Exchange, ndi matelefoni achinsinsi omwe amayendetsedwa mkati mwa kampani yokhayo. Odziwika m'magulu akulu kapena ang'onoang'ono, PBX ndi mafoni omwe amagwiritsidwa ntchito mkati mwa bungwe kapena bizinesi ndi antchito ake osati ndi anthu ena, kuyimba mafoni ndi...
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