Competella is one of the switchboard and Contact center providers for Skype for Business. For about 1 week a go they got a new version name R2.5.
When you want to upgrade the prosess is nice and clean. Just an inbound upgrade if you are on R2 version.
If you run Routing Agent to handle your busy-on-busy, well you need to go to build 137. If you have it already, well you don't need to upgrade to this.
Customers has alsread start to request this upgrade from R2 to R2.5, and also to ask for GDPR tuning for Comptella software, where Competella has provided a guide to configure this and make your Competella switchboard and ContactCenter GDPR ready.