As a customer, you could set up a personal customer login. Click on Login under SIP Lines/User and enter your e-mail address.
Choose here: Choose account
Je nachdDepending on which accounts you are authorized in, you can select the desired account here with your Single Sign On Login: peoplefone HOSETD User
Logged in as a user, you have the possibility to set up forwarding, manage the personal phone book, etc.
Under SIP Lines/User – Phonebook, you can add your personal contacts.