Posted by Eddie Shortt on 19 April 2016 04:46 PM

After interoperability errors were identified whilst performing the upgrade on Wednesday the 13th April 2016, we have resolved the errors and a resolution has been implemented. As such we will be completing the migration on Wednesday the 4th May to new, upgraded hardware & software. This is to allow for our continued expansion of the platform.

This work will occur between midnight on Wednesday the 4th May 2016 and 3am on Thursday the 5th May 2016. The Derby SIPLink service should be considered At Risk between those times. During the At Risk window the existing cluster will be disconnected from the network and the new cluster connected in replacement. This disconnect will cause all active calls to drop. Node4 engineers will aim to do this at a time of low call traffic where possible to minimise impact.

A change freeze will be put in place from 9am Wednesday the 4th May 2016 to allow engineers to copy the configuration from the old platform onto the new platform and perform appropriate checks. During this change freeze no changes will be made to the Derby SIPLink platform unless they are deemed business critical and approved by the migration team.

Node4’s SIPLink platform in DC3 Leeds will be unaffected by this work.

If you have any questions, please contact the Node4 Service Desk.


UPDATE – This work has now been completed and the new hardware and software has been installed with minimal downtime. We are monitoring the customers using SIPLink and calls the are routing correctly with media flowing in both directions. If, however, you are encountering any problems as a result of this change then please contact us on 0845 123 2229 or raise a support ticket at


Thank you for your patience and cooperation during this maintenance window.

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