How much is IP phone service monthly?

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Are you getting the most out of your office telephone system? Are you seeking cheaper alternatives? Would you like to be able to run your operations at a fraction of the cost? Then we have solutions to tailor to your demands. A private branch exchange (PBX) is a telephone network that is generally installed in a medium to large office. The PSTN connects to the PBX, supplying one or more telephone lines for incoming and outgoing calls. Incoming calls for an entire company can come into a PBX and be routed appropriately. Each telephone connected to the network is referred to as an extension. PBX can network with public switched telephone networks (PSTN) telephone over phone lines or with IP enabled phones over ethernet. PBX server systems are considered in detail: the open source asterisk system and Cisco Unified Communication manager and Microsoft Response Point. Office telephone systems come in the following varieties:
*Key System- when the extensions have a set of buttons that users press to  manually choose the outgoing line, they are referred to as key systems. *Centrex- is a service that is offered by the telephone company when switching and the software to control the system are located at the end office or another central office. It is similar to a PBX. A Centrex system places telephone extensions or individuals desks which allows both internal and external calls. * PBX- these systems can be either private or circuit switched and often connect using POTS. *PABX- private automatic branch; exchanges automatically select an available outgoing line.
*ISDN- this type of PBX; connects to an ISDN line. *IP PBX or IPBX – with the implementation of digital networks, most PBX, now offer voip or this type of PBX. These systems emulate the function of a telephone exchange: they establish, maintain and disconnect conditions. Most of them also provide usage information. The range of calling features of PBX can be quite large and they can add the following unique features to a standard home telephone lines: auto attendant, automated directory services, call distribution, conference calls, custom greetings and welcome messages, music or radio on hold, paging, roaming extensions, voicemail and voice message broadcasting. Save more with ip phone services.