I have done the basic setup to broadcast the voice using informacast. but I can dial the number from any phone. please assist me to specify only a particular phone to dial the informacast number. also, user can disconnect the announcement by pressing the speaker button. any way to disable that option?
You should not alter anything with partition on your phone. The phone(s) that should be able to call the paging system should have the partition in the calling search space that it has assigned on either the device or directory number. What you basically need to do its this.
Create a PT, lets call it Paging_PT for simplicity
Put the RP for the paging system in that PT
Put the Paging_PT into any CSS that should have access to call to the paging system. This does not need to be a new CSS, it could be a present one, it all depends on your needs. If you need to limit this to a smaller group than what your current CSS would allow you create a new one based on a copy of a current one and add the Paging_PT to that
If you created a new CSS assign that to the device(s) or directory number(s) that should be able to call to the paging system