Hosted Telephony is a future proof and cost effective service that allows calls to be made over the internet. It is also known as SIP Trunking and works by plugging into your existing phone system, replacing your traditional voice ISDN service. As calls are made and received over a broadband connection they are much cheaper and allow full access and therefore management control over our online portal. BT Openreach have announced they will be switching off their existing PSTN and ISDN network by 2025 and switching to a single IP network, Hosted Telephony is one alternative solution.