SIP Trunking is a cloud VoIP solution used to deliver phone lines to an IP PBX or any kind of VoIP or SIP capable business phone system or gateway.

To understand it better, SIP Trunking is an application layer protocol that helps establish voice and video sessions between devices or applications through the internet, unlike a traditional phone line, which relies on fixed connections through Telco’s to communicate.

SIP Trunking Buyer’s Guide

SIP Trunking services are increasingly popular in companies because they are more flexible, feature rich and less expensive than traditional land lines. Its popularity in the market has also led to a greater number of suppliers in the market. The experts in digital telephone systems at RingOffice have prepared this guide for all people who do not know what to look for in a SIP Trunking service provider.


The first point of contact between customers and your business is the phone. Poor audio quality or busy tones due to insufficient capacity reflect poorly on your business. Here are some things to look out for when choosing your SIP Trunking service provider:

  • Infrastructure: Some providers of SIP services do not have their own infrastructure and depend on a third party to troubleshoot and solve problems.
  • Number portability: Make sure your provider can transfer all your existing numbers so that you do not end up with multiple providers and multiple bills.
  • Coverage: Not all providers are equipped to handle global traffic well. Make sure your provider is able to offer premium quality routes that can handle all your call traffic with business class quality.
  • Support: Having a knowledgeable support team to assist in a timely manner is priceless when you run into an problem that affects your business operations.



SIP Trunks are exposed to cyber-attacks by hackers just like any other device that connects to the internet. Some providers do not have anti-fraud systems. Anti-fraud systems can help protect you from excessive costs of fraudulent calls caused by cyber-attacks.


A major benefit of SIP Trunks is flexibility. SIP trunking allows you to share channels capacity across many phone numbers and even locations globally. It can also give you the ability to scale up and down your channel capacity as needed. SIP Trunks are also easy to configure and move whenever needed. All of these benefits result in tremendous convenience, dynamic calling capacity and cost savings.


A great feature of SIP Trunks is Burstability. Some providers allow you flexible capacity so you can overflow beying your channel limit when needed. This comes in handy on busy days and helps avoid customers from hearing busy tones on days when your business is busy.


As opposed to traditional land lines, SIP trunks are very easy to configure and manage. There is no need to send a technician to your office when setting up a SIP Trunk or adding channels. Features can also easily be managed online so you never have to wait days or weeks to implement changes.


SIP Trunks should allow you full control of call flows in a failover scenario. Features like failover forwarding, failover voicemail and time of day based call flow rules can make managing your incoming call flow very easy in the event of a site outage.


If your business has already made the investment to buy communication equipment, find a provider that offers a compatible service with standard SIP based VoIP phone systems and gateways and not the other way around.

If you are looking for your company to change from traditional land lines to Cloud Communication or SIP Trunking technology, make sure you understand the benefits of the devices and choose a SIP Trunk service provider that is reliable, prioritizes quality and gives you flexibility and control to manage your communication service as needed.

If you are not sure which service is right for you or have questions about SIP Trunking services, do not hesitate to contact the RingOffice experts. We are here to answer your questions and help you design a solution that best suits your business needs.