246 Configuring Digital Private Network Signalling System1Enterprise Edge 2.0 Programming Operations Guide P0911588 Issue 01When EI is used to intrude on a call in progress, a three-way connection isestablished between the originating party and the two parties on the call. The resultis 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 typeExecutive 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 indicationtone will sound after intrusion has taken place, and the standard conference call tonewill sound every 20 seconds.Intrusion levelsWhether or not a set will accept or reject an Executive Intrusion request depends onthe level of intrusion protection programmed. Each set (DN) has an IntrusionCapability 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 activecall, EI will occur. It is assumed that the intruding set always has a higher ICL, asit will not be an Enterprise Edge set. For this reason, it is best to set the IPLs of mosttelephone 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 thewanted party, EI is allowed. Since EI is a receive-only feature, the ICL is not anissue, and in fact cannot be set on Enterprise Edge.• IPL: determines the set’s ability to refuse intrusion. If the IPL is lower than theoriginating 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.
