①
Select a group, to check the contacts in this group.
②
Press the icon to add a contact.
③Type in the contact name.
④
Type in the number 1, it must be a room number.
⑤Type in the number 2, it can be a SIP number or IP number.
⑥Select a specific ring tone for this contact.
⑦Select a group for this contact
⑧Press this icon to save the contact.
⑨
Press this icon to cancel the operations.