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A Private Branch Exchange (PBX) is a telephone exchange located within an businesses premises. PBX interconnect all company phones and incoming phone lines so it can distinguish between internal or external calls and distribute them appropriately Most companies paying for 2 or more phone lines can take advantage of the cost savings and features of a PBX system.
IP Systems are also known as IP PBX systems. The Principle is the same as the PBX Phone systems above but the difference is the you are using an internet connection to send and receive calls as opposed to the copper phone lines. This offers extensive call cost savings as sending phone calls over an internet connection (VoIP) is considerably cheaper. Most IP systems run a combination of regular phone lines and VoIP lines (VoIP lines are termed SIP Trunks).
VoIP
Voice over Internet Protocol (VoIP) works by taking analogue audio signals (as in talking over the phone) and converting them into digital data which can then be sent via an internet connection. VoIP has now advanced so that with a DSL line (Broadband connection) you can make calls to almost anywhere at a significantly cheaper rate. Businesses can enjoy vast savings by using a dedicated DSL line for all VoIP calls and replace costly PSTN lines.
PSTN lines are the basic copper wire telephone lines. PSTN is an ackronum for Public Switched Telephone Network also known as POTS (plain old telephone service). In Australia the main provider for these telephone lines is Telstra.
Intergrated Digital Services Network (ISDN) is the intergration of analogue and data networks. By doing this you have all your voice calls as well data (eg.data from the internet or email between staff) travelling through the same lines but at a much greater volume and speed compared to standard phone lines (PSTN Lines). There are two types of ISDN, BRI (Basic Rate ISDN) and PRI (Primary Rate ISDN). Basic Rate ISDN (BRI) is intended for home or small business use where as Primary Rate ISDN (PRI) is for medium to large business as it has greater capacity, but costs a lot more.
Single Line Telephone (SLT). This is just PSTN phone line. There are many possible uses for an extra SLT in business such as running ADSL (broadband), fax, or just having an extra PSTN line for private use or as a failover if your system breaks down.
SIP Trunks are a computers equivilent of phone lines. SIP stands for Session Initiation Protocol which is the language computers use to communnicate when voice calls (VoIP), multimeida distribution and conferences are made. So if you make a VoIP call you would be using a SIP Trunk to do so.
A GSM Gateway is a hardware device in which you insert a SIM card (like in your mobile phone) and connects to your phone system. This enables your system to then use the gateway as if it were a mobile phone, making calls from landline (through the gateway) to mobiles much cheaper or in some cases free (depending on mobile plan).
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