If you have phone numbers outside your organization that users call on a frequent basis, you can make users' lives easier by assigning extensions to those numbers.
Maybe you have remote workers on a separate telephony system or a key customer that you want to be able to reach easily. You can associate an extension with their external phone number. You can then contact them using their extension just like you'd contact anybody else in your organization with an assigned extension. And when someone who's been assigned a virtual extension calls into your organization, their assigned internal extension and name appear on the caller ID.
Create a Virtual Extension
You can set up virtual extensions at the organization level or the location level. The organization level enables everyone across your organization to dial the same extension number to reach someone. The location level virtual extension can be dialed like any other extension assigned to the same location. Users in the same location only have to dial the extension, while users at other locations can reach the virtual extension by dialing the location routing prefix plus the extension.
Before you begin
There are two modes of operation for virtual extensions. The mode you choose applies to your entire organization. The default mode (Standard) will be used by the vast majority of customers. The steps presented here apply to the Standard mode. You can select the other available mode (Enhanced), but virtual extensions won't function properly unless your PSTN provider supports special network signaling extensions (edge case). For more information, see Change Your Virtual Extension Mode.
The number you associate with the extension must be a valid E.164 number.
From the customer view in https://admin.webex.com, go to , and then click Create Virtual Extension.
Choose one of the following options: