Contact

An example of the header is shown below:

Contact: <sip:555@10.132.10.128:5080>

Multiple header fields support: Yes

The header properties are shown in the following table:

Header Level Action	Add	Delete	Modify	List Entries
Operations Supported	No	No	No	3

Keyword	Sub Types	Attributes
Expires	Integer	Read/Write
GruuContact	String	Read/Write
IsGRUU	Boolean	Read/Write
Name	String	Read/Write
Param	Param	Read/Write
URL	URL	Read/Write*

* Host name cannot be modified in the URL structure for a contact header.

Below is a header manipulation example:

Rule:	Change the user part in the Contact header in all INVITE messages to fred: ■ Message Type: Invite ■ Action Subject: header.contact.url.user ■ Action Type: Modify ■ Action Value: 'fred'
Result:	Contact: <sip:fred@10.132.10.128:5070>