The office PBX (Private Branch Exchanger) system or office intercom system is a kind of a business telephone system which in the new era of VoIP could mean multiple types of systems. All the office PBX phone systems that have a voicemail system can automatically answer the inbound phone calls without a physical person requirement and hence can provide an auto attendant operator. Hence, it also saves the labour cost by redirecting the employees to do other valuable tasks. It is optional and auto attendant be used anytime as per the requirements. Features such as caller ID, call transfer, voicemail, call forwarding, automatic call distribution to multiple extensions, conferencing and more is a part of the standard calling systems for all VoIP and digital PBX phone systems.

With capabilities like call routing to mobile phones, cell phone applications, and voicemail to email connectivity to iPhone and Android mobile phones, employees can manage calls on the go with today's digital, hybrid VoIP, and cloud VoIP PBX phone systems.