According to the customer it is really loud and annoying. You can’t hear the caller when someone pages.
Individual phones can be configured to not take part in paging: Phone web-UI > Phone > Supplementary Services > Paging Serv: no
The nature of paging in the SPA9000 Voice System is that the person doing the paging expects everyone to hear the page.
With this in mind, the phone automatically places the caller on hold while the group page is in process.
The volume of the page is controlled by the individual's volume settings and the level that the person paging uses.
So it's not that the volume of the page is so high, it's that the caller is unexpectedly put on hold.