how to generate barcode in vb.net 2010 Structure of the SIP Protocol in Software

Generation Code 39 in Software Structure of the SIP Protocol

Structure of the SIP Protocol
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Think of the response status line as informing the user of the request status. The STATUS CODE is a numerical code used by the receiver to identify the status of a request. It is a three-digit code followed by a text field that provides a textual description of the code for us humans that are number-challenged. While the various network entities will be able to interpret the numeric code, there is no reason as a technician or engineer to memorize these codes, since they are always followed by the REASON PHRASE, which is always in plain English. The status codes are defined by class, the first digit indicating the class of the code. There are currently six classes defined:
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1xx 2xx 3xx 4xx 5xx 6xx
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Provisional Success Redirection Client Error Server Error Global Failure
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There are processes that are associated with each of these classes, explained in subsequent chapters. The provisional class indicates that a request has been received and is being processed. This is a normal response to a request, serving as an acknowledgment. The purpose is to prevent retransmission of the request, as we will discuss later. Provisional status codes are defined in more detail in 3. Success indicates that the request has been processed and action has been completed. This response would follow a request requiring some form of action to be taken by a server. Redirection is sent when a session is being redirected to another address for the same subscriber. For example, a request may be sent to a subscriber address, but the subscriber has provisioned his or her services to redirect all requests to another device. The redirection response will indicate the reason for the redirection and provide additional details as to where the message is being redirected. Client error indicates that the requestor (the SIP client) sent a request with bad syntax or some other form of error, and the SIP server is unable to process the message. Server error status codes indicate an error on the part of the message recipient, or the SIP server. The request itself was valid, but for the reason indicated in the error message, the server was unable to process the request. Finally, global failure status codes indicate that a request cannot be fulfilled by any SIP server for the reason indicated by the individual code itself. The exact wording for each of the status codes is defined in the standards; however, there are provisions made to allow for other languages. While the standards highly recommend the use of the defined text, the defined text may be replaced by other descriptors such as a different language.
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Now that you understand the format of a SIP message, let s look at the various headers and how they are used. The next session will describe the headers as defined by the IETF and how they are used in a SIP network.
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Header Fields
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Header fields contain detailed information about the request or the response. This includes the destination and origination addresses of some requests, as well as routing information. The header field uses the form of
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header name: header value
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There can be spaces between the header name and the header value fields, so you may encounter implementations of this; however, the standards highly recommend against the use of white space between the header name and the header value, recommending the use of a single space between the two. There can be multiple appearances of the same header name within one request, such as the ROUTE header name. When this appears multiple times, the order is not specific, but it is recommended that routing should be listed in the top of the request so that the routers and proxies in the network are able to parse these messages quickly. There can be mixed orders, though, for example:
ROUTE: <russell@tekelec.com> ROUTE: <jones@tekelec.com> SUBJECT: Lunch at 1:00 ROUTE: <smith@tekelec.com>
The point is, while the standards do recommend using some form of order in the headers, it is not required, and the header names can be in a mixed order. The receiving entities should still be able to process these requests even though the order is mixed (although it may slightly slow the processing of the request). Another worthy note is that the contents of the header field are not case sensitive. The exception to this rule is when a value is part of a quotation. This would be the case when text, for example, is to be displayed on a subscriber device. In this event, the text is displayed exactly as it is found within the header field. There are two classifications for header fields: request header fields and response header fields. Some header fields only make sense in a request, for example, and therefore are ignored if they are received as part of a response. Header fields can be represented in both long form and abbreviated form. The RFC has defined short, abbreviated versions of each of the header fields for use where bandwidth is a concern. The abbreviated versions are provided with each of the header field descriptions that follow. Table 2-1 identifies all of the possible header names, and what methods they appear in. The INFO method has been left out of this table because no information regarding actual required headers could be found.
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