A tannoy is an extension, when called from a phone will call a group of phones, switch them to speaker mode and play on the loud speaker whatever the caller says into the calling phone.
Here is an example
When a call comes in for 444 then use phones in the group test as a tannoy.
Under ‘Stuff’ you would create a group called ‘test’ and add the phones you wish to broadcast to.
A word of warning. A tannoy is one of the easiest ways to use up the broadband to your site. When adding phones to the group do so with the understanding of how much bandwidth) you have.
A tannoy is typically used for various reasons, including: