Traditional private branch exchange (PBX) multiple phones connect to an organization without recourse to the public switched telephone network (PSTN).
PBX is similar to, but it can be replaced version called IP - PBX by a voice over Internet Protocol (VoIP). Companies that have improved their internal VoIP telephone networks should always connect the outside world. This is where the SIP trunking can be used.
Close to the outside
- Foreigners, the numbering in the PBX system may direct dial extensions within the organization.
Several extensions can call outside the network at the same time. For this reason, PSTN traditionally attends a number of lines of the organization. Each of these a load support.
SIP
Session Initiation Protocol (SIP) is a standard email opens and closes a call to IP telephony. Although SIP is itself only a small part of all software and necessary agreements for VoIP, took a number of devices used in VoIP this shortcut to their involvement with the Internet. SIP is an example of this.
SIP trunking
SIP is the provision of VoIP companies require a set of rows. An Internet connection replaced physical cable, that previous external calls business bouquet. If the call to the PSTN, VoIP provider this denunciation managed the final destination.
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