Structure of the SIP Protocol
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TABLE 2.1
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Header Field Summary ACK BYE X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X CAN INV X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X OPT X X X X X X X X X X X X X X X X X REG X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X MSG X NOT X X X X UPD X X X X SUB X X X X
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Header Field Accept Accept encoding Accept language Alert info Allow Authentication info Authorization Call ID Call info Contact Content disposition Content encoding Content language Content length Content type CSeq Date Error info Expires From In reply to Max forwards MIME version Organization Priority Proxy authenticate Proxy authorization Proxy require Record route Reply to Require Retry after Route Server Subject
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(Continued)
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TABLE 2.1
Header Field Summary (continued ) ACK X X X X BYE X X X X X X X X CAN X X X X X X INV X X X X X X X X OPT X X X X X X X X REG X X X X X X X X MSG X X X X X NOT X X X X X UPD X X X X X SUB X X X X X
Header Field Supported Timestamp To Unsupported User agent Via Warning WWW authenticate
Accept
The ACCEPT header field identifies the format of the request contents. For example, in the next example, the accept header field indicates that the format for the request at the application layer is SDP, with HTML text.
Accept: application/sdp;level=1, application/x-private, text/html
When this header field is not present, the default value will always be SDP.
Accept Encoding
The meaning of this header field is almost identical to that of ACCEPT. This header field restricts the coding for the header field. The default value of this header field if absent is no encoding. An example of this header field is:
ACCEPT ENCODING:gzip
Accept Language
This header field is used when a language other than English is to be used for the status codes, SDP, or status responses. When this header field is absent, the default is that all languages are accepted by the server. Here is an example of the ACCEPT-LANGUAGE header field:
ACCEPT LANGUAGE: da, en-gb;q=0.8
Alert Info
This header field is typically used within an INVITE request to indicate the use of an alternate ringtone (the ringing tone used to alert the called party) to the server; however, it can also be used to indicate a different ringback tone. If this appears within the 180 RINGING response, this header field indicates the use of an alternate ringback (the tone that the calling party hears). It also provides the location of the file providing the audio ringtone or ringback tone. Here is an example of an ALERT-INFO header:
ALERT INFO: <http://www.ringtones.com/sounds/clapping.wav>
Allow This is used by user agents to indicate the methods supported by the user agent. Whenever the ALLOW is present, all methods supported must be included or it will be interpreted that the absent method is not supported. However, the absence of
