BT have announced their plans to migrate all customers to an IP network by 2025, switching off the company’s ISDN network. SIP technology has been available for 15 years, with many organisations still preferring to use ISDN lines for their familiarity. As of August 2013 there were around 3.2 million active ISDN lines in the UK. However, by 2025 all organisations will need to move to an SIP service.

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