To add a contact, select Add contact, select New or From call list. Press Add, enter the name and press OK. Select Number, enter the number, press OK and press Save.
To delete a contact: select Delete contact, select the name, press Delete, and then press Yes.
Use the central phonebook
Enter Contacts 
, and select Central phonebook. Select Search by name, Search by number, or Last result. Enter the first letter(s) in the first name, and/or the first letter(s) in the family name. Press Search. The Central phonebook will be searched and a list of matching names will be displayed. You can step to the next entry in alphabetic order by pressing the Navigation key. Press
More to add contact, or press Call or the Call key 
to make the call.
Use the company phonebook
The company phonebook has to be imported via the PDM before it will be visable in the handset. See User Manual, Cordless Telephone 3725.
Enter Call list. A contact from the company phonebook is
marked with the 
symbol. Select name/number and press Call, only work number is available for the contact and it is not editable.
Soft keys, Hot keys and Multifunction button
The three Soft keys below the display can be defined for specific functions such as dialling a specific number.
A long press on a Hot key can have the same function as a Soft key and any key 0, 2 - 9 can be programmed as a Hot key. The Multifunction button can also be programmed for different functions with the use of long press and double press.
For more information about Soft keys, Hot keys and Multifunction button, see User Guide, Avaya 3725 DECT Telephone.
Avaya 3725 DECT Telephone - Quick Reference Guide