Successful replacement of overlay services lies in careful and accurate definition of the Statement of Requirement (SoR)
Firstly, you should research your existing business application service so you have a good understanding of what has to be replaced.
It will be useful to obtain usage and cost statistics from your existing management information (MI), bills or by approaching your current supplier. It will also be useful to obtain system diagrams and other applicable documentation which may have been created during the original system installation or as part of maintaining and operating the system.
The next step is to analyse whether it is applicable to replace the service on a like-for-like basis or whether it is beneficial to alter the specification to best meet current and future needs. As replacing any system is unlikely to be pain free, this may be a good opportunity to enhance a particular system, either in functionality or in quantities. This is particularly evident in the case of video services, which could move from simple room-based end-points towards unified communication systems (for example, Microsoft Teams). Conversely, the replacement system could also be down-sized to meet current needs.
A detailed SoR document for the replacement new services should then be constructed. This document should also include service-level agreement (SLA) requirements, maintenance coverage requirements and any other requirements that are essential for the business.
Rather than house equipment on customer premises, you should request services which are cloud based and can be used seamlessly over both the HSCN and the internet. We recommend that services should have minimal reliance on the HSCN Peering Exchange. Ideally, services should be network agnostic, so you can avoid being locked into using you chosen HSCN connectivity service provider for these additional services.
Voice and video services need to be fully interoperable with each other. You should choose services that are easy to use, are intuitive and provide a good end user experience.