Nortel BCM50 Configuration Manual page 57

Setting redirection
The timer used for the network Callback feature is also used for redirection.
Executive intrusion
Executive Intrusion (EI) is a DPNSS 1 feature that allows an operator, or other calling party, to
intrude on a line when it is busy. An example of the use of this feature is to make an important
announcement when the recipient is on another call.
EI is similar in functionality to BCM Priority Call, but it is a receive-only feature on BCM
telephones. EI cannot be initiated from a BCM telephone. The person using this feature must be on
another PBX system on the DPNSS 1 network.
When EI is used to intrude on a call in progress, a three-way connection is established between the
originating party and the two parties on the call. The result is very much like a conference call.
When one of the three parties clears the line, the other two remain connected, and EI is terminated.
Restrictions by telephone type
• ATA2/ASM8+—supported
• ISDN—not supported
The telephone receiving the intrusion displays Intrusion Call. A warning indication tone
will sound after intrusion has taken place, and the standard conference call tone will sound every
20 seconds.
Intrusion levels
Whether a telephone accepts or rejects an Executive Intrusion request depends on the level of
intrusion protection programmed. Each telephone (DN) has an Intrusion Capability Level (ICL)
and four Intrusion Protection Levels (IPL).
When the ICL of the intruding telephone is higher than the IPLs of both telephones on the active
call, EI occurs. Nortel recommends that you set the IPLs of most BCM telephones to the default of
None, or Low or Medium.
Intrusion levels are described as follows:
• ICL: determines the ability of the attendant to intrude. As long as the ICL is higher than the
IPL of the wanted party, EI is allowed. Because EI is a receive-only feature, the ICL cannot be
set on BCM.
• IPL: determines the ability of the attendant to refuse intrusion. If the IPL is lower than the ICL
of the originating party, EI is allowed. For general purposes setting the IPL to None, Low or
Medium is recommended, unless intrusion is not wanted.
Chapter 2 System telephony networking overview
Networking Configuration Guide
57