From the past to the future

With BT switching off #ISDN in 2025, how can you make the switch to #SIP trunking as painless as possible? BT have announced their intention to switch off the PSTN and ISDN networks by 2025. Customers will be migrated to a single IP core network that ultimately will replace all legacy networks and platforms. PSTN and ISDN: What’s the difference? …