Polycom IP 331 User Manual page 19

Contact Management - Telephone local directory
Contact management (add, delete or update a contact) is managed via Escaux
Connect.
The local telephone directory on your phone is not linked to Escaux Connect.
As a consequence, all modifications to your contacts made via your phone
directory (add, delete or update a contact via your phone directory) will be
erased when your phone is rebooted.
We therefore advise you not to use the local telephone directory and to use
Escaux Connect to store your local contacts.
The speed dials are managed via Escaux Connect but they are available via your
phone: for more information see further.
The corporate directory is available on your phone in read-only: see further.
www.escaux.com