SIP Trunks Defined!


SIP Trunk

SIP (Session Initiation Protocol) trunking is essentially the use of VoIP (Voice Over IP) to connect a PBX (private branch system) to the Internet. Today, big and small businesses are using Video as part of their communication methods. In SIP, the Internet takes the place of traditional telephone trunk. Via this system, an enterprise is able to connect with mobile and fixed telephone subscribers across the world. Here are some basic facts about this system that will help you understand it better:

• SIP helps initiate multimedia user sessions • The trunk is the link/line that has the capacity to carry a number of signals at one time; it connects various nodes and switching centers within a communications system • If a business wants to take advantage of SIP trunking services, they would need to have a PBX which connects to all the end users within the system • The enterprise would also need an ITSP (Internet telephony service provider) and a gateway; This is the interface between the ITSP and the PBX • When you use SIP you are able to bunch voice, video, and data in just one line; this eliminates the need for separate media for every mode

SIP functionality

With SIP, a subscriber can:

• Receive and make calls • Receive and make long-distance calls • Access directory assistance • Make 911 calls • Use mobile and fixed telephone sets • Browse the www • Employ texting and email functions

Take a closer look at the benefits of SIP

• No requirement for PSTN, PRIs or BRIs gateways- You don’t have to purchase any of these gateways, and this reduces telephony costs. It very cost-effective and easy to extend the reach of your system via SIP.

• No need for separate data or voice connections- When you use a SIP trunk system, it reduces costs even further, as it eliminates the requirement of separate data and voice connections. This is also a scalable option; as your enterprise expands, you already have all the infrastructure to handle the additional data and voice traffic. • All calls can be turned into local calls- You can outsource your PSTN connectivity to a third-party. This significantly brings down long-distance charges because the calls made via SIP travel over the IP network of the provider, or over the Internet.

• No more expensive 800 numbers- Via a SIP trunk service you will be able to establish local numbers in all the cities your business has a presence in, which your customers can call. All these calls can also be terminated locally and will be delivered to your company’s call center, via the Internet.

• Telephone Number Mapping (ENUM)- This is used to look up the numbers automatically to identify whether they actually match any known SIP address. Once the system has determined this, the call can then get completed over the Internet, instead of it getting transferred out of the PSTN. So, when you communicate with other businesses that use SIP for communications, you end up saving money as there is no added traffic on the PSTN.

In addition to all these benefits, you need a relatively small investment to set up a SIP system for your business. You save a considerable amount of money when you use a SIP trunk provider service. When you convert to VoIP you would need an IP-PBX and IP Phones.

You would also need to purchase a SIP-aware firewall- this would help maintain security when VoIP traffic is being admitted. Very simply, a SIP trunk system can provide a significant ROI & will pay back the initial costs within a short time (in some instances even within 6 months).


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