Event

An example of the header is shown below:

Event: foo; id=1234

The header properties are shown in the following table:

Header Level Action	Add	Delete	Modify	List Entries
Operations Supported	Yes	Yes	Yes	N/A

Keyword	Sub Types	Attributes
EventKey	Event Structure (see Event Structure)	Read/Write
Param	Param	Read/Write

Below are header manipulation examples:

Example 1	Rule:	Add parameter itsp-abc=voip to the Event header ■ Message Type: Invite ■ Action Subject: header.event.param.itsp-abc ■ Action Type: Add ■ Action Value: 'voip'
	Result:	Event: foo;id=1234;itsp-abc=voip
Example 2	Rule:	Modify the Event ID string: ■ Message Type: Invite ■ Action Subject: header.event.EVENTKEY.id ■ Action Type: Modify ■ Action Value: '5678'
	Result:	Event: foo;id=5678;
Example 3	Rule:	Modify the Event package enum: ■ Message Type: Invite ■ Action Subject: header.event.EVENTKEY.EVENTPACKAGE ■ Action Type: Modify ■ Action Value: '2'
	Result:	Event: refer;id=5678