EPABX & telephony

Port count and growth allowance are the first numbers to settle for an EPABX, since adding lines later can mean replacing the cabinet. EPABX systems, IP phones, intercom units and telephone handsets are used together across offices, plants and campuses. State the extensions and trunk lines needed, analogue or IP handsets, voicemail and call-recording needs, and whether existing cabling and power backup must be reused.