By: trioadmin On: February 26, 2016 In: Uncategorized Comments: 0

The lifespan of ISDN is coming to an end. There has been much speculation in the industry as to when BT might switch off the PSTN and ISDN networks but now BT  has announced it’ll be switching ISDN off in 2025. Whilst there is not urgency to change, it...

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