SIP Trunking – Your questions answered

If you’re thinking of making the move from PSTN to SIP trunking, you may well be in the know that doing so will transform the way you communicate and take your business a step further. But if you are no experienced telecommunication technology professional, then chances are that you have many questions. Here we explain what exactly SIP trunking is and how it can improve your business communications while saving you money.

Short for Session Initiation Protocol, SIP is the technology that empowers VoIP (Voice over IP), whereas SIP trunking is the method of delivering telephone and other unified communications services such as voice and video data over the Internet. If this is somewhat abstract, then imagine the SIP trunk as a ‘pipe’ connecting your office or house to your provider that carries the data channels inside it.

Essentially serving as the virtual equivalent of the traditional business phone line, it works with SIP-enabled PBXs where one or more channels are connected to it and with phone numbers and DIDs directly linked to the SIP trunk. What’s the difference between a SIP line and a SIP channel? Whereas the SIP trunk is the container, so to speak, the channel is the path for concurrent calls. With the Internet replacing the traditional trunk via SIP, users can communicate with both landlines and mobiles around the globe.

Some things to consider

An ideal option for businesses that already make use of a PBX system, setting up a SIP trunk becomes easy and inexpensive most especially if hardware is already available. Having said that, it can also work with a SIP-ready PBX, as well as with traditional analog or key system by making use of an IAD (Integrated Access Device) or an ATA (Analog Telephone Adapter).

What you need from your end to make use of SIP trunking? A PBX that can connect to all internal end users, an Internet Telephony Service Provider (ITSP) such as Vanilla Telecoms and a gateway that will work as an interface between the PBX and ITSP.

Why you should take the plunge

From reduced communication costs to enhanced scalability to fit your business’ growing needs and higher-quality user experience, there are many benefits to SIP trunking. Have a look at the most important ones below.

But with SIP trunks being exposed to the Internet, having a well secured network, as well as an anti-fraud system in place is integral. In addition, bearing in mind that good voice quality is a crucial component of any business communication system, it is important to ensure that your internet bandwidth is sufficient to support your setup, most especially when it comes to the expected number of simultaneous calls. Lastly, when considering to make the switch, look for a provider that can offer a full portfolio of cloud features and services, including tools for interactive workflows and sharing documents and most importantly, all the elements needed that will allow you to truly enjoy the real-time flexibility that make for unified communications and collaboration.

What Cempilli can do for you

Catering for both small and large application, Cempilli provides both single and unlimited SIP trunks at unbeatable prices. A single channel trunk allows only ONE call (either incoming or outgoing) at any one time, whereas an unlimited channel allows unlimited simultaneous outgoing calls and up to 10 simultaneous incoming calls per DID.

SIP has certainly become the standard for business communications. But did you know that SIP-based telephony can also be valuable in a home setting? If you would like to benefit from low-cost, high-quality, SIP based telephony, Cempilli’s Grandstream HT701 pack will allow you to enjoy a home and on-the-go phone system while keeping your existing phone and landline.

You can have a look at our prices or go straight to our signup page to instantly set up your system. Alternatively, contact us on

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