SIP trunking stands for Session Initiation Protocol and is a telephony technology that enables businesses to make and manage voice calls, and other unified communications services over the internet. Essentially, SIP trunks are virtual phone lines that enable users to make and receive phone calls over the internet to anyone in the world. With the impending ‘Big Switch Off’ of the public switched telephone network (PTSN), SIP trunking is rapidly replacing traditional ISDN lines. It connects PBX to the PTSN via broadband, ethernet or private circuit into our national network. SIP trunks are a highly flexible alternate to ISDN and compatible with all the leading IP PBX brands in the UK market. Ultimately providing you with peace of mind that your PBX hardware works with the network service. SIP trunking technology is suitable for any business from small scale set-ups to enterprise organisations and - as a leading provider of SIP trunking solutions - Focus Group are ready to deliver the huge benefits of the ‘SIP switch’ to your business.