This service enables the message transmit to multiple phones by dialing '*399'.

For example, set this field to '1000,1001,1002' for example. Now dial*399. Extensions 1000,1001,1002 will be paged. If UAD/Phone supports it, the call will automatically go to the speakerphone, otherwise it will just ring

NOTE: Phones by default have 10 seconds to auto answer.