SIP Content Type and Length

INVITE sip:bob@biloxi.com SIP/2.0
Via: SIP/2.0/UDP pc33.atlanta.com:5060;branch=z9hG4bK776asdhds
To: Bob <sip:bob@biloxi.com>
From: Alice <sip:alice@atlanta.com>;tag=1928301774
Call-ID: a84b4c76e66710
CSeq: 314159 INVITE
Contact: <sip:alice@pc33.atlanta.com>
Content-Type: application/sdp
Content-Length: 142
(Alice’s SDP not shown)

Content-Type indicates the type of message body attachment (others could be text/plain, application/cpl+xml, etc.)

Here “application/sdp” indicates that it is SDP

Content-Length indicates length of the message body in octets (bytes)

0 indicates that there is no message body.

Transcript

[slide135] And then the content. In this case, we say it's an application type SDP, and then we say how long it is.