Since the late 80’s ISDN has been the de-facto telephony connectivity solution of choice; however, with no significant development in over a decade and a BT switch-off date set for 2025, it’s time to retire your ISDN for good.

Getting on for 2 million channels being used today, SIP trunking is fast-becoming the obvious replacement for traditional ISDN services. Aside from the significant financial savings possible with SIP, this has been driven by both the need for a more flexible approach to ‘voice’ and the requirements of Unified Communications.

Five reasons to switch to SIP…

1 – Save money on call costs and line rental

SIP delivers less costly, more reliable connectivity than ISDN over an IP connection. It can save up to 50% on line rentals and 25% or more on call costs.

2- Free internal calls and great features

Perfect for medium or large organisations with multiple sites, not only will you save on your line rental and call costs, but you’ll get free internal calls within your organisation and a whole host of great features.

3- Scale up and down when you want

SIP trunks are ideal if you are moving, upsizing or downsizing and want to keep your existing numbers. Scale up lines during busy periods and back down again afterwards. You can add lines, take them away, split calls at any time. You are always in control.

4- Built-in Business Continuity

SIP trunks can handle emergencies easily. They are inherently disaster recovery / business continuity ready, letting you reroute calls to an alternative location quickly and easily.

5- Compatible with Skype for Business

Our SIP trunks are integration tested and approved to interoperate with Microsoft Lync / Skype for Business, allowing you to directly connect to the platform to make external calls.


Contact Amillan today to learn more about our SIP Connectivity Solutions.

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