Cseq

An example of the header is shown below:

CSeq: 1 INVITE

The header properties are shown in the following table:

Header Level Action	Add	Delete	Modify	List Entries
Operations Supported	No	No	No	N/A

Keyword	Sub Types	Attributes
Num	Integer	Read Only
Type	String	Read Only

Below is a header manipulation example:

Rule:	If the Cseq number is 1, then modify the user in the Contact header to fred. ■ Message Type: Invite ■ Condition: header.cseq.num=='1' ■ Action Subject: header.contact.url.user ■ Action Type: Modify ■ Action Value: 'fred'
Result:	Contact: <sip:fred@10.132.10.128:5070>