When an Announcement needs to be played back to a caller this is accomplished through the Announcement Circuit Pack. The caller will be connected to a channel of the Announcement Circuit Pack and the right Announcement will be played back.
An TN750 Announcement Circuit Pack has 16 channels, An TN2501 Announcement Circuit Pack has 31 channels one single Announcement can be played back on all channels at the same time. When all channels are busy the callers that need to be connected to an Announcement will be put in a separate Announcement Queue.
The maximum size for the Announcement Queue on G3si is 200 calls, on the G3r this is 4000 calls.
When a channel comes available the DEFINITY will get call(s) from the Announcement Queue towards this channel and playback the right Announcement.
The maximum number of calls that can be connected on one single channel at the same time and listen to the same Announcement being played back is 50 calls for the G3si, and 1000 for the G3r.