Log into https://app.onsip.com/ then, select Administrators at the top right corner.

Choose Users on the left.

You can use the Search option at the top to locate the User you would like to update.  Double click the User name to expand the options.

Under the User Info tab, you can customize/edit the user's SIP address, enable e911, and add an extension by selecting "Edit info". 

When adding an extension(s) select the "Add Extension" option .

Then key in the available extension you wish to use and click the "+" to add the extension to the list of extensions.  The extension should appear in the Extensions box.

NOTE: We recommend that extensions are four digits long starting with number 7. For example: 7001. You can add multiple extensions for a user. For instance, you can create an extension to be used internally and an extension that will be dialed externally, or from customers calling into your main line. You can create as many extensions for a user as needed.

 

Next is the Call Settings tab, here you can update the Inbound and Outbound Call Preferences.

Then Voicemail tab, this is where you can add or edit your voicemail options such as the mailbox number and pin, time zone, message waiting indicator and playback options, email notifications and custom greeting.

There are three other tabs you can further edit your User settings on.

The Phone Settings tab is where you can see your phone provisioning and SIP registration details. 

From the Communications tab, this is where you can choose to send the Welcome Email, Voicemail Configuration instructions and send the OnSIP password reset email. 

Finally, is the Advanced tab, this is where you can add an Alias SIP address and phone number(s), and Permissions to your User.

 

Giving a User SIP Aliases

You can give a user one or more SIP Aliases. A SIP Alias is essentially a sub-user for a main user. For example, if you create a user named Kimberly, you can then add a SIP Alias of "Kim Support," which could be added to a group or ACD Queue.

This can be done under the Advanced tab, by selecting "Edit info" selecting  “+ Add SIP Address” then keying in the additional address and select “Add Address” .

Finally, "Save changes" at the bottom right.

SIP Aliases are useful in combination with a multi-line SIP phone. In the prior example, main user "Kimberly Test" can be registered on line 1 of a phone, SIP Alias "Kim Support" on line 2, "Kim" on line 3, etc. A user would then be able to tell if someone is calling into their main line or to one of their SIP Aliases.

Note: Please be very careful if you delete a user as his information cannot be recovered afterwards.