SIP Trunking, DIDs and SIP Trunking for Dummies, CX Master
With regard to real-time communications, there are two aspects that businesses focus on. They would like a system that not only saves them money in the long run but is more efficient than the system they already have in place. This way, they can seamlessly upgrade their system while at the very same time keep their more sophisticated users happy.

 
Earlier, a PBX telephone system and later PRI (Primary Rate Interface) Line, integrated with TDM (Time Division Multiplexing) interface. This allowed 25 to 30 individual voice lines for a single connection and was the most used business telco system in place. It was easy to use and manageable at the time.
 
Various employees connected to the same system could call one another using the employee specified extension or use a programmed digit – “7” for instance – if they wanted to get an outside line. The way these lines were connected to one another is how branches of a tree are connected to the trunk of that tree, hence the term “trunking”. Even though the system worked for decades, it was not cost-effective and it had problems. Thus, as soon as companies saw a way out, they took it and what we call SIP trunking emerged.

How Does SIP Trunking Work?

As mentioned, the PBX and later the PRI system worked well for a long time, but as soon as SIP trunks utilizing VoIP (Voice over IP) was introduced businesses realized that additional alternatives existed. SIP trunks, coupled with VoIP, were faster since it used a data connection to connect users to a network, often the same data connection that the business used to access the internet for other reasons also.
With the development of technology in use, SIP trunks with VoIP services could easily-manage voice signals through a data connection. This helped businesses realize significant cost savings as they were able to make a call and video connection as well as hosting cloud services and managing an e-commerce business all through the same network.

ITSP

SIP trunking used a carrier called the ITSP i.e. Telephony Service Provider that offered the VoIP Services. It relied on internet services and protocols as opposed to circuit-switch voice protocols in use for the purpose. This enabled businesses to merge their voice connections and data usage under a single data connection, allowing them to save serious amounts of money annually. Additionally, it also provides a private system with public access, serving the purpose fulfilled by the traditional circuit-switched voice i.e. transport and termination of SIP trunk calls.
 
 

SBC

The key purpose of using SIP trunking services is to provide a seamless transition between different VoIP gateways. Here, VoIP is the device handling the calls and video conferences, while SIP is the protocol that enables smooth handling of both calls and video conferences. The one element here that keeps this system running smoothly is the SBC i.e. the Session Border Control. It is the device that protects a private network by managing traffic and preventing spammers and blacklisted users, such as telemarketers from gaining access to the network. This keeps the system running smoothly.

What Role do DIDs Play In the Process?

DID or Direct Inward Dialing is a series of numbers that are primarily used to dial into your PBX i.e. Private Branch Exchange or networks. These numbers are allocated to the customer and then forwarded to your respective PBX through SIP trunking services
 
The PBX is distinguished on the basis of the last three or four numbers in the series. These digits are known as DNIS i.e. the Dialed Number Identification Services and are responsible for routing the information to the correct telephone extension directly.
Presently, DID services are provided on a PRI circuit. DID services also play a similar role with VoIP communications, using PSTN to reach users directly. It works as a gateway to route and translates calls between the two networks. It is also worth mentioning that with a DID in place, your business can get the much needed local presence which plays a significant role in increasing your profit margin. Not only does it enable number portability but it also provides you with local number availability lacking the toll-free 800 number. This can help you build a local presence without having to change your number.

Why Prefer SIP Trunking Services?

When all has been said and done, as a business owner, your primary concern is probably how the service could best benefit your organization. Thus, here are a few reasons to prefer SIP Trunk Services for your business.

SBC and Networked Policy Management

SBC is the one element of your SIP Trunk Services that keep all the spam at bay while securing your network and keeping it from overloading. Thus, it goes without saying that many SBC based solutions require hands-on policy management as well as configuration, especially if you require a big deployment.
 
This may cost a bit in the initial stages, but if you keep your needs in mind and choose wisely, it will definitely be money well spent for you and your business. Plus, they handle bulk traffic, which makes your entire system run efficiently.

Media Support and scalability

With trends in the world of communication changing on a daily basis, it is a given fact that business will continue to move into better, more efficient forms of media which can improve the pace of business. This includes video conferencing and high-definition audio among the few things.
Thus, equipping your business with state of the art SIP trunk services will ensure that it is always able to keep up with the changing megatrends of the telecom world, keeping your business a step ahead of the competition.
 
Additionally, most SIP Trunk Services are scalable. Meaning, as soon as you have more traffic that needs to be handled, you can easily just upgrade a few components and you are ready for that extra capacity.

Ironclad Security

Most highly ranked SBC and SIP trunking services have a network firewall in place which is backed up by a highly efficient intrusion prevention system. These not only keep spam at bay but also deter data based attacks, enabling it to work with various different systems.

Robust Session Management

As you increase the range of your PRI to SIP services, expanding to VoIP apps, one thing that you will notice immediately is the robust session management of the new system you have in place.

The Bottom Line

At this point, you have a general idea of what of the various aspects of real-time communication dealing with business SIP Trunking services. It is one of those efficient and always evolving systems that can be modified at any time to fit the needs of your expanding business. 
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Hutch Morzaria

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