ISDN is dead long live SIP!
Posted by Elaine Bellamy on 14/09 at 10:00 AM SIP, Telephone lines,
ISDN is dead

In this updated infographic, “ISDN is dead, long live SIP”, we explain the reasons behind the decline in ISDN use for business telephone line services and why SIP is the favoured alternative.


BT Wholesale has confirmed ISDN and PSTN voice services will no longer be available to purchase from September 2023. This is an issue that businesses cannot afford to ignore.


Four years may seem like a long time right now, but it will fly by, leaving any businesses who have not prepared for migration to SIP in a rather uncomfortable situation, especially as the long-term plan is to switch off all ISDN and PSTN voice services in December 2025.


If you are unsure what SIP is, please read our no-nonsense fact sheet on SIP to find out more.


Meanwhile, please see our infographic below:

Posted by
Elaine Bellamy's avatar
Elaine Bellamy on 14/09/2018

Elaine has worked with us since 2013 and has successfully progressed into the role of cloud and connectivity team leader.

She is responsible for looking after our existing customer user base and migrating potential new customers to our fixed lines, SIP, mobiles and Internet services, as well as public and private hosting services, data solutions, Microsoft Office 365, Wi-Fi and filtering.

Before joining us, Elaine worked in customer service environment for 12 years. Elaine enjoys spending time with her family wandering the beaches of south Devon, interior design and is a keen follower of current fashion trends.

Contact: elaine.bellamy@swcomms.co.uk

Contact us now

Send us a message