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A PBX system with a shared line connected to a plurality of telephone devices includes one or more processors that control a connection for an incoming call from a caller, the one or more processors being operable to access a listing that includes one or more callers or calling numbers designated as

A PBX system with a shared line connected to a plurality of telephone devices includes one or more processors that control a connection for an incoming call from a caller, the one or more processors being operable to access a listing that includes one or more callers or calling numbers designated as private to a first telephone device. The one or more processors being further operable to send an alert to only the first telephone device in the event that the one or more callers or the calling numbers in the listing includes a caller or calling number associated with the incoming call. It is emphasized that this abstract is provided to comply with the rules requiring an abstract that will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims.

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1. An Internet Protocol private branch exchange (IP-PBX) system for an enterprise comprising: a first interface to connect with an IP network;a second interface to physically connect with a shared line of the enterprise, the shared line being associated with a single telephone number or extension, t

1. An Internet Protocol private branch exchange (IP-PBX) system for an enterprise comprising: a first interface to connect with an IP network;a second interface to physically connect with a shared line of the enterprise, the shared line being associated with a single telephone number or extension, the shared line being connected to a plurality of telephone devices, each of the telephone devices being associated with only a single user;one or more processors that control a connection between the IP network and one or more of the telephone devices on the shared line for an incoming call;a memory coupled to the one or more processors, the memory storing a listing of one or more callers or calling numbers designated as private to a user of a first telephone device of the plurality of telephone devices, the listing being configurable by the user;the one or more processors being operable to access the listing in the memory in response to the incoming call, and to send an alert to only the first telephone device in the event that the one or more callers or the calling numbers in the listing includes a caller or calling number associated with the incoming call, the one or more processors being further operable to cut off a media stream associated with the incoming call to all of the plurality of telephone devices on the shared line except the first telephone device. 2. The IP-PBX system of claim 1 wherein the alert comprises a periodic ring. 3. The IP-PBX system of claim 2 wherein the alert further comprises a text message display that includes a name or number of the caller. 4. The IP-PBX system of claim 1 wherein the one of more processors execute a program that controls routing of the incoming call from the IP network to the first telephone device. 5. The IP-PBX system of claim 1 wherein the incoming call comprises a voice over Internet protocol (VoIP) call. 6. A processor-implemented method of handling an incoming call from a caller to a shared line associated with a single telephone number or extension comprising: receiving, by an Internet Protocol Private Branch Exchange (IP-PBX), an incoming voice over IP (VoIP) call from a caller;accessing, by the IP-PBX, a listing stored in a memory, the listing including one or more callers or calling numbers designated as private to a user of a first telephone device of a plurality of telephone devices connected to the shared physical line, each of the telephone devices being associated with only a single user, the listing being configurable by the user;sending, by the IP-PBX, an alert only to the first telephone device in the event that the one or more callers or the calling numbers in the listing includes the caller; andestablishing, by the IP-PBX, an exclusive a media path on the shared line between the caller and the first telephone device. 7. The processor-implemented method of claim 6 wherein sending the alert only to the first telephone device comprises ringing the first telephone device. 8. The processor-implemented method of claim 6 wherein sending the alert only to the first telephone device comprises displaying a text message that includes a name or number of the caller on a screen of the first telephone device.