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?

PSTN stands for Public Switched Telephone Network, also referred to as the Plain Old Telephone Service (POTS). Analogue voice data flows over circuit-switched phone lines (copper wires) owned and operated by your phone provider.

ISDN (Integrated Services Digital Network) allows both voice and data services over digital lines, for example video conferencing, data transfer and direct-dial in. ISDN digital services provide multiple channels per line, enabling simultaneous phone calls.

The alternative – VoIP

Instead of using PSTN & ISDN lines (the expensive ‘line rental’ part of your telecom bill) ‘Voice over IP’ transmits voice traffic over your Internet connection. Already many businesses are realising that VoIP or voice services, are a very cost effective way to manage telephony within an organisation: this has contributed to the overall decline in take up for PSTN / ISDN services.

For many BT business customers this move by the company will force them to explore new telephony systems, with the added benefit of a more cost effective solution.

So, if your business currently relies on one of the 3.2 million ISDN channels in the UK, what do you need to know about the ‘big’ switch off?

What to do now

If your current traditional telephony contract is up for renewal soon, now is the time to start exploring the benefits and opportunities of VoIP technology. These include:

Cost savings – no line rental, cheaper calls including International calls, and free calls between your organisation’s offices

Mobility – remote workers can login to your VoIP from anywhere using an Internet connection, even on their mobiles

Multi-functional – as well as voice calls, VoIP can also be used for video-conferencing using a VoIP phone

Integration – because VoIP technology uses the Internet it is possible to integrate it with your other business systems, such as email clients or customer records

Scalability – VoIP technology scales easily to your business. New phone lines can simply be added, reassigned or removed depending on your business’ needs

We can check your office Internet can handle VoIP.

When to migrate?

We would advise businesses to start thinking about migrating now rather than later. Essentially ISDN is a legacy platform.

Dates for your diary

More information here:

how to make the move from ISDN to SIP
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