Under the "Extension / Trunk" tab, click on "Extensions" from the drop down.
Since there are many fields, it is recommended to create a single extension. You would then export it so that all the extensions have the same settings.
You will update the following fields:
Extension: Extension Number
CallerID Number: Number to be displayed as outbound caller ID (optional)
SIP/IAX Password: See Command below
Voicemail Password: See Command below
User Password: See Command below
First Name: First name of user
Last Name: Last name of user
Email Address: Email of user
Phone Number: Cell phone number of user
Permission: Access this extension has to outbound call
*Internal *Local *National *International
Save the extension file and import it.
Select the file. Please use UTF-8 encoding when importing a .CSV file. .CSV files can be opened using programs such as Notepad and saved as a UTF-8 encoded file.
Verify and apply your changes.