When we buy new device such as Aastra Telecom 6755i we often through away most of the documentation but the warranty.
Very often issues with Aastra Telecom 6755i begin only after the warranty period ends and you may want to find how to repair it or just do some service work.
Even oftener it is hard to remember what does each function in IP Phone Aastra Telecom 6755i is responsible for and what options to choose for expected result.
Fortunately you can find all manuals for IP Phone on our side using links below.