I am using Hiptah Manger E software to manage our Siemens Telephone Exchange which is 6 years old. All the connected digital phones have Extension Number, Date, Time and Company name  on their phone display. How can I change the Displayed Name to a new name so that once I change in the exchange  the new text  appear on display of all the connected Digital telephones which are mostly optipoint 500 Standard or Advance.