How to add phone number on DOORKING 1834 intercom system

In this video, we will add/edit, and delete phone number, [phone], to the intercom system.
Before we add a phone number, we need to create an area code pointer:
First, press * 2 4 and enter master code.
Then, enter 3-digits area code pointer.
Next, enter 4-digits area code.
Repeat previous 2 steps for adding multiple area code pointers.
Last, press 0 and # to exit programming mode
To add or edit a phone number:
Step 1, Press * 4 1 and enter master code.
Step 2, enter a directory code for the tenant.
Step 3, enter the 3-digits area code pointer.
Step 4, enter 7-digits phone number.
Repeat step 2 to 4 to add or edit more phone numbers.
After you finish press 0 # to exit programming mode
To delete a phone number:
Step 1, press * 01 enter 4 digits master code.
Step 2, enter phone number's directory code.
Step 3, press # 7 times, and * 1 time.
Repeat step 2 and 3 to delete more phone numbers.
Press 0# to exit programming mode.