For our business phone lines we use SIP trunks: the long-term replacement for ISDN. They use ultra-reliable, dedicated voice broadband to carry voice traffic, video, and other forms of media. Compared with ISDN and Analogue Lines, SIP can save your business a significant amount of money with its lower monthly line rentals and call costs.
BT is set to switch off the ISDN network by 2025. The switchover is already happening for many businesses to upgrade their business phone lines. Future proof your infrastructure by moving to SIP today.