A SIP message is crafted from the Header Field that it transmits signals and Routing information to the SIP Network entities. SIP has a form like the HTTP Header (RFC 2616). The Header Field is defined as type Header Field. Describe the function of the SIP Header:From: point out the similarity at the start of the SIP Request. From Header is usually the AOR of the sender. It contains a SIP or the SIP URI and an optional display name.To: indicates the desire to have the recipients of a SIP Request. Go to Header is an AOR of the recipient. It also contains a SIP or SIP URI and optionally display the name.Call-ID: this field identifies a sequence of series a message. Call_ID must be identical for all SIP and SIP rRequest Response sent by the UA with a dialog.Cseq: is crafted of a method name and integer value. This field recognize Orders and continue the SIP Request in a dialog. Cseq also has the distinction of sending back a message and a new message.Via: specify how to retrieve the path by a request and determine where the response should submit.Contact: get to know a SIP or SIP URI where U want to get a new SIP Request.Allow: allow a list Header of the SIP Method received the support of UA that generates the message.Supported: all the SIP extensions supported by the UA. The extension of the SIP RFC 3261 RFC and the other. Describes the option tag 100rel like RFC 3262.Require: about that it's like the Supported Header, but the support of SIP extensions in the remote UA is to the transaction to be processed.Content-type: specify the type of the message body that is attached to the SIP Request or Response must be displayed if the SIP Message contains a body.Content-Length: determine the size of the message. SIP SIP Request and Response also contains the Header Field.Related Protocol SIP is part of the Protocol. Includes: SDP, RTP and RTCP.
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