Due to our continuous expansion, our local telephone exchange was no longer adequate. It was expensive and inflexible. Moreover, we had a lot of ISDN lines and related high costs. Our IT company CDM ICT advised us to switch to VoIP. Since everything runs in the cloud, there is no longer a need for local hardware. So no more costs for maintenance and renewal. The redundant ISDN lines could also be removed immediately. We now have many more features (IVR, central phone book, etc) at a much lower cost.
We had problems with our old telephone exchange for quite some time. This was not very flexible and it was always very expensive to have someone come. We have had this replaced by a VoIP solution via CDM ICT. From now on everyone is easily accessible (also in the classrooms without a telephone connection, because an internet connection is sufficient). Missed calls arrive as an attachment in our mailbox.