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Best SIP Trunk Providers - 2. Reviews, Pricing & Demos.
SIP trunking is a network service that allows businesses to connect Vo. IP phone systems to the traditional phone network. While this service is generally included with “per- user” licenses for cloud- based phone systems, if you have an on- premise system you’ll most likely need a SIP provider to connect calls with it. We’ll explain what SIP trunking is, why you need it, and the primary considerations that you should factor in when deciding on a provider. Here's what we'll cover: What Is the Session Initiation Protocol (SIP)? What Is a SIP Trunk.
Benefits of SIP Trunking. Features of SIP Trunking Service. Important Considerations for Buyers. What Is the Session Initiation Protocol (SIP)? Imagine the Internet as a vast network of roads and highways. On it are many types of vehicles, delivering various- sized packages (or packets, to use the technical term) containing a variety of information at a wide range of speeds.
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Most Internet users only ever see the contents of the vehicles traveling on the roads. But like real roadways, the Internet has many layers below the surface. These lower layers support—and determine the quality of—the layers above them.
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Each layer has its own specific set of languages used to communicate within that layer. These languages are called “protocols.”One of the lowest layers supporting the Internet is called the link layer. Within the link layer, link layer protocols organize groups of local connections into large networks.
At the top, just under the surface, is the application layer. The application layer determines the quality of the “road surface” directly above it. SIP is a protocol that operates within the application layer.
Different application layer protocols are used to create different surfaces. The Internet has a wide variety of road surfaces, some favoring certain types of traffic over others: Compare a heavily loaded truck slowly climbing the rough road surface of a hill to a sports car zipping down smooth concrete.
Some surfaces work better for certain purposes. Vo. IP—phone conversations over the Internet—are one very particular type of traffic. They require audio to be delivered consistently with minimal delay. SIP is an application layer protocol designed to provide a very certain type of road surface for this special traffic. SIP initiates the sessions (or connections) that prepare the network to best meet the specific needs of a real- time audio connection over the Internet.
We offer a fuller explanation in our article on the SIP protocol. What Is a SIP Trunk?
We’ve mentioned that SIP trunking is a network service. It’s necessary because Vo. IP calls travel over the internet rather than the traditional phone network.
This means that you need some way to connect calls between the internet and the traditional phone network, as otherwise you’d only be able to call other users with Vo. IP. SIP trunking is the solution to this problem. A SIP trunk isn’t a phone “line.” Instead, you connect to your SIP provider’s network using your internet connection.
Your SIP provider utilizes specialized technologies to create a bridge between the internet and the traditional phone network, thereby connecting calls between these networks. In some cases, you can get SIP trunking from the same company that provides your internet service, but in other cases you may need to use separate providers for SIP trunking service and internet service. If you don’t have SIP trunking, you won’t be able to do much with a business Vo. IP phone system aside from admiring the server hardware. And while the traditional phone network is dying in the United States, it’s alive and well across the globe, so the need for SIP trunking isn’t going to disappear anytime soon. Benefits of SIP Trunking.
SIP trunking can cut costs in the following ways: Lower trunking costs. Combined voice and data connections have traditionally been provided by telecoms in the form of Integrated Services Digital Network (ISDN) lines, also known as trunks. ISDN trunks come with fixed quantities of lines per trunk (for example, T1 trunks have 2. If a business needs even one additional line, it must purchase another entire trunk—meaning businesses often pay for unused capacity.
SIP trunks are comprised of bandwidth, a flexible commodity, and their capacity can be increased on the fly. Lower equipment expenses. Offices without SIP trunks use media gateways to translate between the analog PSTN and the office’s internal digital traffic. Offices using SIP trunks don’t need this expensive piece of equipment because their traffic bypasses the PSTN. A SIP trunk also makes it more practical for an office to use a cloud- based phone system rather than purchasing and maintaining an in- office hardware version.
Lower calling charges. Traditionally, and under many existing calling plans, charges are calculated based on the physical length of the PSTN line required to complete a call.
Calls made via SIP trunks bypass most of the PSTN and so avoid many long- distance charges. SIP providers also frequently offer better rates on international calls than traditional phone service providers, and most importantly, intra- office calls and calls between branch offices are frequently free when connected via SIP trunking.
SIP trunking also has a number of technological advantages: More communications options. A SIP trunk extends, in a virtual sense, an office’s internal network to the outside world—letting remote offices, mobile employees and customers worldwide interact as if they were in the same building. Click- to- call website options for customers, application sharing and simple call transferring for work- at- home or abroad employees, for example, can all be done more easily with SIP trunks. Meanwhile, SIP client apps can facilitate communication via a mobile device over an Internet connection, with capabilities such as voicemail, SMS messaging and more. Features of SIP Trunking Service.
The following table shows some common features of SIP trunking service: Bursting. Traditionally, if you needed more calling capacity on your phone lines, your provider took a month or longer to deliver it. Puzzle Kingdoms L Repack Eng 2009 Nfl more. SIP providers, on the other hand, can scale capacity up and down in as little as 2.
Port sharing. If you have multiple sites, and one site maxes out its number of simultaneous calls, you can connect calls via open ports at one of your other sites. Again, this is a vital cost- saver for call centers. Disaster recovery. In case of a service outage at one of your sites, your SIP provider can forward calls made to critical phone numbers.
E. 9. 11 support. Your SIP provider can support 9. Without E. 9. 11 support, Vo.
IP isn’t compatible with emergency services. MPLS support. Multi- protocol label switching is a networking technology that allows information to be routed within a network using path labels rather than the network protocols we discussed above.
This offers performance, reliability and security benefits, and some businesses prefer to have SIP trunks delivered over MPLS. You’ll need to make sure your provider offers both MPLS and SIP trunking services, however. Important Considerations for Buyers.
Phone system deployment type. Whether you have an on- premise or cloud- based system is the most important factor affecting your approach to SIP trunking. Businesses with cloud systems may not even need a separate SIP provider.
In most cases, SIP trunking is included with “unlimited” user licenses for cloud systems. The vendor generally doesn’t even mention that SIP trunking is included, given the complex nature of the service.
Other cloud vendors provide “metered” SIP trunking - i. SIP trunking service priced using per- minute rates. If you have an on- premise phone system, however, you’ll need to search for a SIP provider, as generally vendors of on- premise systems don’t offer SIP trunking. Phone system brand.
Different phone system vendors have implemented the SIP protocol in their systems in different ways.