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Multi-Level Precedence and Preemption
371
Order of call preemption
The following is the order of call preemption:
1. the lowest precedence call
2. If there are multiple calls on the same precedence level, then the
following order is used
a. any outgoing call that is unanswered
b. the oldest incoming call that is unanswered
c. the oldest held call
Preemption scenarios and behavior
The following table describes the IP Deskphone behaviors that occur
when receiving a call of higher precedence than the presented current
calls and no call appearances are available.
Table 20: When a preemption call is received
Call state Preemption behavior
While on an active call
1. Preemption tone is played through the
Handsfree speaker.
2. The active call is removed.
3. The preemption acknowledgment screen
is displayed. See Figure 86, "Preemption
acknowledgement screen", on page 373.
4. When the preemption call is
acknowledged by pressing OK, the
preemption tone is ended and the new
preemption precedence call is displayed.