General

Calls can be preempted that terminate at:

• Trunks

• Telephones

• Attendant consoles

• Nonqueued hunt groups

• Vector Directory Numbers (VDNs)

  Since with Precedence Routing, precedence calls cannot be terminate at queued hunt groups or terminating extension groups (TEGs), other calls to these facilities cannot be preempted.

Adjunct Switch Applications Interface (ASAI)

ASAI is notified if a call is preempted and disconnected from the current call.

Communication Manager Messaging system

The Communication Manager Messaging system is notified if a call is preempted and disconnected from the current call.

Call Detail Recording (CDR)

CDR has two records for a preempted call. CDR has a record of the original call, and a record of the new call after the preemption.

Call Management System (CMS)

CMS is notified if a call is preempted and disconnected from the current call.

Call Coverage

A call that the system redirects to a coverage point cannot be preempted.

Call Pickup

A call that uses Call Pickup cannot be preempted.

Code Calling Access

A call that uses Code Calling Access cannot be preempted.

Emergency Calls

Emergency calls can be preempted for H.323 deskphones. But you can administer Communication Manager to block the preemption of emergency calls.

For network preemption, emergency calls are not preempted irrespective of the flag setting on Communication Manager.

Avaya Interactive Voice Response (IVR) system

The system notifies the IVR system if the system preempts and disconnects a call from the current call.

Group Paging

A call that is part of a group page cannot be preempted.

Loudspeaker Paging

A call that uses Loudspeaker Paging cannot be preempted.

Malicious Call Trace

A call that uses Malicious Call Trace cannot be preempted.

Modem Pooling

A call that uses a modem pool cannot be preempted.

OPTIM OPS

An OPTIM OPS trunk can be preempted.

Personal central office line (PCOL)

A call that uses PCOL cannot be preempted.

Precedence Calling

When a precedence call attempts to preempt an existing call, call progress tones or the blocked precedence call announcement indicates why the system did not complete the call.

The following table shows how precedence calls are processed, depending on the precedence level of the call and the precedence level of the preempted trunk.

Precedence Call Waiting

Regardless of how you administer Precedence Call Waiting, calls with a higher level of precedence always preempt calls with a lower level of precedence.

Radio Paging

You cannot preempt a call that uses Radio Paging.

Recorded Announcements

You cannot preempt a call that is connected to a recorded announcement.

Secondary Extension

You cannot preempt a call that uses a secondary extension.

Transient calls

You can preempt calls, either ringing or on hold, that are in a transient mode.