User Guide

Preemption
Only two simultaneous calls can be presented. If your IP Deskphone reaches the maximum
call limit and you receive a higher precedence call, then one of the existing calls is preempted
in order to present the higherprecedence incoming call. An incoming call with a precedence
level less than or equal to the already-received call precedence levels is not presented.
Note:
Emergency 911 calls can be preempted when there are no available call appearances and
there is an incoming above-Routine precedence call.
IM sessions cannot be preempted because they do not count as a call appearance.
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 22: When a preemption call is received
Call state
Preemption behavior
While a call is on hold
1. Preemption tone is played through the Handsfree
speaker for three seconds.
2. The preempting call presents with the appropriate
ringing.
3. The new preemption precedence call screen is
displayed.
An incoming call is ringing
1. The preempting call presents with the appropriate
ringing.
2. The new preemption precedence call screen is
displayed.
Multi-Level Precedence and Preemption
292 Avaya 1120E IP Deskphone with SIP Software User Guide November 2013
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