Siebert have provided our telephone systems for over 10 years. In this time we have expanded from 3 offices to over 30 offices and Siebert have given me some great advice during this period. We find their sales people and engineers to be very helpful in the planning, setup and maintenance of our phone systems. I can readily access all the systems Siebert have supplied from anywhere on our network. This allows me to manage any changes required easily so that we can respond and react to changing circumstances very quickly. Whenever we have a query Siebert are always more than happy to help us out no matter how large or small the query is. IT Manager. National Travel Agency. Branches all over Scotland.