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www.w3.org/Protocols/rfc2616/rfc2616-sec14.html - 125k -

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Posted by crouse

The "entity-header" fields define meta-information about the message-body or, if no body is present, about the resource identified by the request. The term "entity header" is an HTTP 1.1 term where the response body can contain a transformed version of the message body. The original message body is referred to as the "entity". We retain the same terminology for header fields but usually refer to the "message body" rather then the entity as the two are the same in SIP.

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Posted by george99

Header Field:

Contains fields that provide additional information about a message,
such as To, From, Subject, and Via.
Certain header fields, such as To, From, and Subject, contain only a
single header field value and appear only once in the header. Certain
header fields, such as Via, Contact, and Route, can appear multiple
times in a header and can contain multiple values separated by a comma.
Following is a sample SIP header:
From:
To: TPU
Subject: Confcall
Call-ID: 132059753@local.xyz.com
Content-Type: application/sdp
CSeq: 1 INVITE

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Posted by sagitraz