Whenever we need to give an important message to a group of extensions in real time, we use the Paging Groups module. If our SIP telephones support a feature called auto-answer, we can use the Paging feature. This feature allows us to dial a number (as if it were an extension) and force the SIP telephones to answer the call, irrespective of whether they are being used or not, and go into the hands-free mode and play through their speaker the caller's message. The list of brands currently supported is as follows:
Aastra
Grandstream
Linksys/Sipura
Mitel
Polycom
Snom
To add a paging group, click on the Add Paging Group link.
Enter in the Paging Extension, the number to dial to activate this feature. It is highly recommended to use a number according to the current dialplan.
Add a description in the Group Description field.
Select the extensions we want in this group. We must hold the Ctrl key and left-click on the desired extension.
Select the Force if busy option to...