Know more about the PBX terms used

Few Definitions of hosted PBX and Virtual PBX:

Paging: Paging means a one-way audio communication from one caller to a potentially large group of listeners
Auto Attendant: Auto Attendant is as an automated receptionist. Its purpose is to offer the caller options for call redirection to a specific user, agent group, IVR, voicemail box etc. Normally they have options like 'For sales press 1, For Accounts press 2 ...'

Agent Group: Agent group is used as a call queuing system to dispatch inbound calls to the agents in a designated order.

IVR Node: IVR Node is a function used to playback a prompt allowing the user to enter DTMF digits to navigate through the PBX functions.
Service Flags: Service flags are used to indicate the state of the pbx i.e. Night Service.

Outbound proxy: An outbound proxy is the setting that tells the PBX where to communicate to for this call. This can be an IP Address or a domain name. If the Outbound Proxy be set, it will restrict inbound calls coming in from the declared destination only, this can increase security of your PBX system.

Conference Room: It allows several participants to call in to an extension and communicate together using voice conference mixer.

Call Back: Calling Card/Call Back allows the user to authenticate themselves with the pbx remotely from a mobile or external device to enable an outbound call to be made using the IP PBX.

Trunk: A trunk is a method of receiving and making calls from and to the PBX from the outside. Calls to the PBX will be received on a trunk from any type of device such as a gateway, IT SIP trunk or another IP PBX. Calls from the PBX leave on a Trunk and could go to any device such as a Gateway, IP PBX or an IT SIP trunk.

Voicemail: Voicemail is included with pbx and sip on each extension. When your phone is not answered, the voicemail will start and offer the option to leave a message for you.

If you mapped your cell phone to your extension, your cell phone will ring to receive calls, and it can ring at the same time your extension rings.