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General
If a B-channel is not available when a call is placed, a fast busy tone is returned. While the tone is in progress, the line is considered busy. If the originator goes on hook while the tone continues, the call is ended and the line is idled. Otherwise, the call appearance is removed and the line is idled 15 seconds after the tone is applied.
A telephone is considered busy when: no SA button (aside from Originate Only buttons) is available, Do Not Disturb is activated, the extension either is being programmed or is in forced idle, or the alarm clock is being set. The caller hears a busy tone, and the call receives coverage, if programmed.
A PRI line can be assigned to only one B-channel group.
If the inside dial plan uses extension numbers with different numbers of digits--for example, both 3-digit extension numbers and 4-digit extension numbers--SID-ANI or other extension identification services may not work properly.
The PRI telephone number assigned to each channel must be unique within the same B-channel group and different from the associated test number. Also, the number of each channel must be the same number as that supplied by the PRI service provider. The test telephone number assigned for each 100D, 100R INA, or 100DCD module in the control unit must be different from the numbers assigned to other channels in the same B-channel group and must be the same number as that supplied by the PRI service provider.
An invalid timer value entered in system programming results in truncation to the closest valid value. If, for example, 45 is entered for a counter that ranges from 0 to 30 seconds, 4 is recorded.
The PRI information report displays the B-channels in the order they were entered into the system, which is not necessarily numerical order.
