ISDN & PSTN Turn-Off? Super Deductions? VOIP? – What Are They and How Can They Impact My Business?
Posted on 22nd October, 2021
What is ISDN & PSTN? Integrated Services Digital Network (ISDN) first appeared in the 90s and revolutionised internet connectivity. The Public Switched Telephone Network (PSTN) is what many regard as the classic analogue telephone system, which enables landline connectivity. For millions of businesses in the UK, PSTN is still the...