SIP trunks: What every business needs to know

Date:
Tue, 29 Jun 2021 10:41:34 +0000

Description:
SIP trunks are an essential part of VoIPbut what exactly are they used for, and what benefits do they offer businesses?

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SIP trunking is a type of protocol used for VoIP, although the relationship between the two has often been confused. In this article, well take a close look at what exactly SIP is, what SIP trunks are, and what the related benefits and limitations for businesses might be.

As well see, SIP trunking provides a robust, scalable, and secure protocol
for voice and other communications, which is one of the reasons why many of the best VoIP providers choose to use this protocol. What is SIP?

SIP stands for session initiation protocol and is a popular method for
sending and receiving communications data over the internet, including voice and video calls. Its used to establish, maintain, and terminate calls in VoIP applications. For example, services like Skype and Zoom that enable you to call another user or even a regular phone line over the internet use SIP to make this possible.

A common question among businesses looking for the best way to unify communications and reduce costs relates to the differences between SIP and VoIP, but this is actually a faulty comparison. SIP and VoIP are not two distinct protocols to be compared. Rather, SIP is just one of several protocols that VoIP providers use to manage calls.

A trunk is a technical term in telephony that refers to a collection of phone lines, although the definition has now grown to include virtual connections like those used by SIP.

SIP trunks replace the copper wire that physically connects machines on a traditional public switched telephone network (PSTN), instead sending information digitally over the Internet. In other words, SIP trunks provide the means for companies to send voice and other communications information over the Internet, both internally and externally.

SIP trunks can also carry text messages, emails, and even internet access,
and for this reason are often employed in unified communications (UC). Centralized vs. decentralized SIP trunks

There are two basic ways to deploy SIP trunks: centralized and decentralized. In a centralized approach, all calls are directed to a single hub (a companys headquarters, for example), and then routed internally to different locations as required. The advantage is having a single, unified system between
multiple locations.

In decentralized SIP trunking, each location or department has its own SIP trunk and manages calls independently. While this is costlier, it is also
more robust, as loss of service at a single SIP trunk wont bring down the whole network. How can your business benefit from SIP trunks?

A business can benefit from SIP in a number of ways.

SIP, and VoIP in general, is typically much cheaper than traditional telephony. Because the data is travelling over the internet, you no longer have to pay per call (much like how you dont pay per email or instant message), and long-distance calls are much cheaper as theyre essentially treated like local calls. In addition, you only need to pay for an internet connection rather than internet and (physical) phone lines.

SIP trunks are also made available in smaller denominations than traditional phone lines, whose trunks are typically offered in groups of 12. In the past, if you needed 14 trunks, youd have to pay for 24. SIP trunks are often sold
in smaller packs, or even individually.

SIP providers enable businesses to unify many of their communications: email, text messaging, voice and video chat, voicemail, digital faxing, and more,
all run through a single system and off a single platform or software suite. In general, SIP and other UC platforms offer a simpler, cheaper solution for internal and external communications, with a quick ROI. SIP can help you
unify office communications. (Image credit: Shutterstock)

SIP trunks can be built with the same encryptions as used for other internet protocols, like TLS, which greatly improves the security of voice and other communications. This kind of encryption isnt possible over traditional phone lines.

SIP and VoIP are also more resistant to disasters, both natural and
technical. Redundancy, back-up and fall-back systems, rerouting calls, and taking advantage of decentralized SIP trunking all make it less likely your business will have to face significant downtime.

An unlimited number of channels (incoming or outgoing calls) can pass through each SIP trunk; the only limitation is bandwidth. As a result, its much
easier (and cheaper) to scale communications when using SIP or other VoIP solutions than with traditional phone lines.

This also results in greater agility, as a business can scale up during communications spikes, and scale back down afterwards.

Because audio, video, and other information is passed over the internet, SIP trunking provides a more flexible means of communication for employees who choose to use their own devices (BYOD) or work from home. Part- and full-time remote workers can be managed much more easily than with traditional
telephone lines.

SIP trunking makes it easy to provide local numbers around the world, even if you have a single location or PBX, providing a more comfortable experience
for your customers than 800 numbers. Its also a much cheaper solution.

SIP trunking also makes it easier and faster to redirect calls, a process which can be automated for an even smoother customer experience. What limitations are there with SIP trunks One downside to SIP is if your internet goes down, so do your phones (Image credit: Google)

There are some limitations associated with SIP trunks compared to other protocols and traditional telephony.

First, because all of your communications are now internet-based, if theres a problem with your internet connection, your phone lines will be out too. The same goes for general power outages. That being said, VoIP and UC providers offer many solutions, like rerouting calls to mobile devices or other
offices, something thats more difficult with traditional lines.

Businesses should also be aware of certain security concerns. While, as mentioned previously, SIP trunks can be encrypted in a way traditional telephone lines cant be, if a hacker gains access to your servers, they will also have access to your communications.

VoIP and UC as a Service (UCaaS) providers often employ robust cybersecurity solutions, however, and its incorrect to say that SIP trunks are more vulnerable than other solutions. In general, they are a safer solutionjust know that vulnerabilities do exist and have to be taken into consideration.

Finally, as your messages and calls now go through the internet, youll need
to make sure you have sufficient bandwidth, and you may need to opt for a
more expensive plan (although, in the end, it will still be cheaper than traditional telephony). Conclusion

SIP trunks provide a flexible, cheap, and reliable alternative to traditional phone lines, and can be used as part of a robust VoIP or UC approach to internal and external communications. SIP trunking reduces cost per call, especially that of long distance calls, and provides a single platform for audio, video, and other communications.

Despite a few limitations, SIP trunking is a method employed by many of the best VoIP providers, and offers many benefits to businesses that choose to
use this protocol. More about VoIP phones and services How to choose a small business VoIP phone service Best VoIP phones : IP handsets for the small business and home office Our latest VoIP phone reviews



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Link to news story: https://www.techradar.com/news/sip-trunks-what-every-business-needs-to-know/


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