Session Initiation Protocol (SIP) trunking is the service that allows you to make calls through your existing internet connection using a Voice over Internet Protocol system. This could be anything from a two-way voice call to a multi-participant video conference.
This is provided by SIP trunk service providers and costs significantly less than making calls through a legacy Public Switched Telephone Network (PSTN). A SIP trunk can be installed over your existing internet connection, removing the need for traditional analogue phone lines, but allowing you to link your legacy equipment to an internet phone service provider.
This method of communication is becoming increasingly popular around the world, with more and more businesses around the world discovering the operational and cost-saving benefits of SIP trunking and adopting it as their primary method of communication.
SIP trunking providers UK
Similar to traditional telecommunications firms, SIP trunking providers supply the necessary software to enable you to make calls.
Other than looking for the most competitively priced, there are a number of other factors you should consider when choosing a provider including the security of its network (does it have an anti-fraud system?), whether it runs its owns network (this ensures it has full control over its service), and whether it can port all your existing numbers ( keep your existing telephone numbers when you move to SIP trunking.
Mitel SIP trunking
A major global provider of SIP trunking services, Mitel claims to have 60 million end users across 100 countries around the world. It provides a variety of communication solutions and products tailored to the needs of different sectors including financial services, professional services, retail, healthcare and hospitality.
Mitel gives your business the option of running its solutions on its hardware or on your own servers through software, meaning you can expand as you see fit.
Windstream SIP trunking
Windstream offers voice and internet bundles specifically aimed at the needs of small businesses. Its lines can be provided with an Analog, PRI or SIP handoff to an organisation’s phone system, enabling you to upgrade your service without an expensive overhaul of your current system, while its network solutions have been tailor-made to help customers scale.
Skype SIP trunking
One of the biggest names in internet communications, Skype Connect enables your company to make low cost online calls by integrating Skype with your SIP or VoIP phone system. This can be achieved by signing in to Skype Manager, buying channels and allocating credit to your Skype SIP profile. After that you just need to configure your Private Branch Exchange (PBX) or VoIP Gateway with the SIP account profile details.
It is compatible with 3CX, Avaya, Cisco, Freetalk, Grandstream, LG Ericsson, NEC, ShoreTel, Siemens and SIPfoundry
Gamma SIP trunking
Gamma SIP Trunks connect businesses with its nationwide network, giving them access to a flexible and lower cost method of inbound and outbound calls.
Gamma’s service can support anything from two channels to smaller businesses to an unlimited number for larger enterprises, making it good option for scaling businesses.
The company’s trunks have the benefit of enabling a geographic number to be kept without call forwarding costs, and can supply SIP Trunking with out-of-area geographic number ranges for customers who want to appear local even if they are not.
BT SIP trunks
BT says its Sip trunks come with a “generous” call allowance and allow for free calls between BT SIP Trunks. It works with its dedicated internet connection BTnet.
BT SIP Trunk phone numbers are no longer tied to the local exchange, enabling you to use any number and market yourself locally. You are also able to take your original number with you if you move premises.
BT SIP Trunk works seamlessly with a BT IP phone system, but can also work with your existing phone system using a BT SIP Trunk Gateway. The provider offers Quality of Service (QoS) that prioritises voice information over other data across your connection to ensure voice communications are of the highest quality.
What is SIP trunking and how does it work?
A SIP trunk is what connects your business to an internet telephony service provider (ITSP). Instead of needing a phone line, an internet connection and a phone system, you just need the just need an internet connection and a phone system.
How does SIP trunking work?
The term ‘trunk’ has been co-opted from circuit-switched communications and refers to the physical line that connects switching equipment; except, in this case, the connection is completely virtual. Nevertheless, it provides the same function, connecting your organisation directly to an internet telephony service provider and enabling VoIP communication without the need for an IP-PSTN gateway. Sip trunks can support a multitude of types of communication, from instant messages to conference calls and video conferencing.
SIP trunking benefits
Aside from a significant reduction costs, SIP trunking provides small businesses with a host of benefits over legacy systems.
- Cheaper calls – local, long distance and international calls are significantly cheaper with a SIP trunk connection as you can make them all as if you were dialling a local number
- A simpler infrastructure – SIP trunking relies on a data network for all types of communication, meaning you don’t need to install additional circuits for voice and data
- More flexible – you can add channels at will to cope with an increased call volume with little hassle or extra cost, meaning it’s easy to scale your system as you grow
- More secure – provided your business firewall is correctly configured, your network will be securely protected against threats but calls will be able to flow in uninhibited
- More reliable – digital circuits are more reliable than PSTN networks, requiring lower levels of maintenance and providing a higher quality of calls