Otherwise, it is assumed that
the disposition is render.
CONTENT-DISPOSITION: session
72 Chapter 3
Content-Length This header identifies the length of the message body, expressed in
octets.
CONTENT-LENGTH: 265
Content-Transfer-Encoding The CONTENT-TRANSFER-ENCODING is used when
tunneling a SIP message within the message body of another SIP message. The header
identifies the encoding used for the ???tunneled??? portion of the SIP message.
CONTENT-TRANSFER-ENCODING: base64
Content-Type This header identifies the type of content contained in the message body.
For example, in an INVITE for a voice call, the message body will carry the SDP describing
the session.
CONTENT-TYPE: application/sdp
CSeq The CSeq header is used for ensuring proper sequencing of transactions during
a dialog. The header, which consists of a decimal number followed by the method
type, is used by endpoints to allow a device to track the proper response to the proper
request.
For example, when an INVITE is sent, and a 2xx response is received, the ACK is
sent using the same CSeq number as the INVITE, but with the ACK method in place of
the INVITE. The CSeq then identifies requests and responses as different transactions
when necessary so that the endpoints can track them separately.
CSeq: 3411 INVITE
Date The DATE header provides the date and time expressed in GMT.
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