In 2025, BT is due to switch off ISDN and PSTN services. But what are they and how will the switch off impact your business?

In the following article, we’ll take a look at ISDN, PSTN, why the switch off is occurring, what you can do within your organisation to ensure you’re ready for the change and what Challenger can do to assist you in the process.

Public Switched Telephone Network (PSTN)

The public switched telephone network (PSTN) is the term used to refer to all the world’s circuit-switched phone networks which are operated by a range of suppliers (generally national, regional or local telephone companies). These systems send voice data through copper wires owned by the phone providers via analogue signals.

Integrated Digital Services Network (ISDN)

Essentially, ISDN is a group of communication standards which allow the simultaneous transmission of video, voice, data and other network services via the circuits found in the public switched telephone network (PSTN). Simply put, your standard phone line is utilised to send both voice and data over the same line. ISDN was introduced to the UK by BT in 1986 but since then connectivity technology has advanced considerably and ISDN has started to be outmoded.

Why the Switch Off?

In recent years there’s been massive investment and roll out nationally in super-fast fibre broadband as well a broad variety of new Ethernet alternatives which provide improved service over ISDN and PSTN. BT hasn’t actually installed any new ISDN lines within central London since 2014 which is an indication of just how many organisations have already moved away from the technology.

However, there are still many companies and individuals (roughly three million) who use ISDN. It’s for that reason that BT has given such a long notice period for the switch off.

What comes after ISDN?

Recent investment in the communications networks within the UK has made fibre-broadband services widely available and affordable to small businesses. What this means is that IP based alternatives (VoIP/SIP) are the most viable alternatives for your business post ISDN.

Voice over Internet Protocol (VoIP)

VoIP is already in use by many organisations. It’s a cloud based phone system, which means all your incoming or outgoing calls are sent over the internet.
VoIP has a broad range of additional features over more traditional ISDN systems such as:

Challenger are expert VoIP providers, with years of experiences in integrating the technology into effective use within an organisation.

“At Challenger, we’re ready and waiting to help your and your company make the switch away from ISDN. We have almost two decades of experience in communications technology and we’re a direct partner to O2. What that means is, we can provide you with the personal service of a smaller organisation with all the logistical benefits of working with a large one.” Jeff Eamens, Managing Director

Session Initiation Protocol (SIP)

Although SIP systems once suffered from reliability problems, since the aforementioned investment in communications these issues have been fixed. SIP is a phone line carried directly over your fibre broadband connection, eliminating the requirement for an ISDN phone line in its entirety.
At Challenger we’ve been providing SIP lines for years. We’ve helped many organisations make the switch from ISDN to SIP services. If this is something you’d be interested in discussing with us, get in contact today 01244 837837!

Why should you Switch early?

We’ve a while to go until 2025 but that doesn’t mean you should wait until last minute to switch your service away from ISDN. There are many advantages to switching to either VoIP or SIP right now and at Challenger we’re ready and waiting to help you through that process.
So, what are the advantages of switching to SIP or VoIP?

Still struggling to work out what this could mean to your business, get in touch with us today on 0330 002 2111 or info@cmc.uk.net to see how we can help.