Restrictions By Set Type; Intrusion Levels - Nortel Enterprise Edge 2.0 Programming Manual

246 Configuring Digital Private Network Signalling System1
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 set type

Executive Intrusion is indicated differently on different types oftelephone sets:
• ATA—Is supported.
• ISDN—Is not supported.
• Portables—Is not supported.
• DNA—Is not supported.
The set receiving the intrusion will display 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 or not a set will accept or reject an Executive Intrusion request depends on
the level of intrusion protection programmed. Each set (DN) has an Intrusion
Capability Level (ICL) and an Intrusion Protection Level (IPL) of 0 to 3 (Low,
Medium and High).
When the ICL of the intruding set is higher than the IPLs of both sets on the active
call, EI will occur. It is assumed that the intruding set always has a higher ICL, as
it will not be an Enterprise Edge set. For this reason, it is best to set the IPLs of most
telephone sets to the default of None, or Low or Medium.
Intrusion levels are described as follows:
• ICL: determines the set's ability to intrude. As long as the ICL is higher than the
wanted party, EI is allowed. Since EI is a receive-only feature, the ICL is not an
issue, and in fact cannot be set on Enterprise Edge.
• IPL: determines the set's ability to refuse intrusion. If the IPL is lower than the
originating party, EI is allowed. For general purposes setting the IPL to None,
Low or Medium is recommended, unless intrusion is not wanted.
To program IPL on a set:
1. Choose Services, Telephony Services, Terminals & Sets, Capabilities.
2. Choose Intrusion.
3. Click a Protection level: None, Low, Med, or High.
If the level of intrusion protection is set to High no intrusions will be allowed.
The default is None.
Enterprise Edge 2.0 Programming Operations Guide P0911588 Issue 01