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SIP TrunkingWhat is it?SIP: Session Internet ProtocolSIP Trunking is a high grade VoIP service which uses a broadband Internet connection to make and receive calls. All calls made via a SIP trunk are handled by a PBX or PABX. In this article we are going to refer to the use of a PBX. (See 3CX PBX) SIP Trunking differs from your normal VoIP account in that a true SIP Trunk will allow you to handle many simultaneous calls at the same time. As such, there are no limits applied by the SIP Trunk Provider (commonly known as a Voice Service Provider, or V.S.P.) on how many calls or 'lines' are available at any one time. What determines this however is the speed of your broadband Internet connection and available bandwidth. A true SIP Trunking service will typically come with a batch of phone numbers - commonly known as geographical, local, or traditional phone numbers - that you can either utilise all at once, or progressively 'roll-out' as demand dictates. These phone numbers usually go by the name DID (Direct In Dial). Here's where it gets technical. When your VSP provisions your service and allocate these DID's against your account, they setup a route for these numbers to your PBX IP address rather than a physical phone line. Here's how it worksYour VSP supplied a batch of 10 DID's against your SIP Trunk 02 9123-4000 Your Static IP Address is: 192.168.0.100 02 9123-4000 ---> 192.168.0.100 When someone calls any of these numbers from any telephone service, the number in effect 'terminates' at the IP address of your PBX - the PBX then passes on the call accordingly.
Things to know...One of main difference that separates your traditional VoIP Account to a SIP Trunk is that all calls made to and from your SIP Trunk are actually 'authenticated' and routed using your PBX's IP address. This is why a Static IP address is required. Generally, you will not be able to enter your VoIP Account settings (for your trunk) into a softphone or ATA as a PBX will be required to route the calls according to your static IP. You might be able to make outbound calls out via a softphone - however incoming calls will most likely fail. With a SIP trunk, your business can effectively make the most out of a multi-line telephone system without the need for individual lines. A SIP Trunk is capable of carrying a fair bit of telephony traffic at once and is only limited to the amount of bandwidth your broadband Internet connection can handle.
A very easy to operate and maintain is 3CX PBX for Windows.
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