Colt continues to support ISDN services

Everything you need to know ahead of the PSTN switch-off.

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Act now to futureproof your services

All operators, including Colt, are modernising their voice infrastructure and are moving to IP. In contrast with most other providers, Colt has no plans to end ISDN services at present and will continue to support the market by offering an ISDN over IP solution.

For customers that still require ISDN using a TDM PBX, Colt offers “Voice Line (v)”, an ISDN over IP service, which provides a seamless upgrade path to SIP Trunking on a future-proof platform.

Colt aims to help as many customers as possible to migrate swiftly to futureproof solutions – a change which is largely transparent and requires little to no physical adaptation at customer sites, apart from the installation of the Colt Voice Gateway next to the PBX. Customers can retain their access to the ‘PSTN’ with their traditional PBX while Colt ensures the network is future proof across all operators. The service is offered in the following European countries: Austria, Belgium, Switzerland, Germany, Denmark, Spain, France, Ireland, Italy, The Netherlands, Portugal, Sweden and the UK.

For existing Colt Online users, the Service Guide is available here.

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Instead of maintaining your own telephony infrastructure, why not move to the Cloud ?

Are you interested in Microsoft teams?

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What service is right for you?

Of course, Colt also offers pure VoIP with Cloud Voice and SIP Trunking solutions. If you cannot make up your mind about which solution is most beneficial for your now, see below:

ISDN Decision Tree
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Other services

In order to maintain the highest levels of availability and service for our customers, Colt is continuously optimising its network. Colt has recently removed SDH technology and migrated customers to newer and highly reliable Ethernet, IP and VoIP technology alternatives. 

PSTN FAQ

Timelines

United Kingdom

Nov 2017

Switch-off announced

BT Openreach announces its intention to switch off the PSTN in 2025.

Dec 2020

Stop-sell trial begins

Stop sell begins at Salisbury trial site.

Oct 2021

Stop-sell expanded

Stop sell announced at 169 Exchanges across the UK.

Dec 2022

Switch-off begins

PSTN is completely switched off at the trial site.

Sep 2023

UK-wide Stop-sell

All PSTN and ISDN services will be closed to new customers, and there will be no upgrades or new features available for existing customers.

Dec 2025

PSTN & ISDN switched off

PSTN and ISDN services will be switched off across the whole of the UK.

France

Nov 2018

Stop-sell of analogue lines

Continued support of existing lines

Nov 2019

Stop-sell of ISDN services (RNIS)

Continued support of existing T0 (BRI) and T1 (PRI) lines.

2023

Technical end of life of PSTN network (RTC)

Gradual migrations to VoIP, phased per geo zones.

Request a quote for Voice Line (v)

Your choice of communications service is as unique to your business as your voice requirements. 

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