qr code c# free Figure 5-12 Application of a proxy server in VS .NET

Drawing ECC200 in VS .NET Figure 5-12 Application of a proxy server

Figure 5-12 Application of a proxy server
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Boss <Manager@pc1homenet> sip:Serverworkcom
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Daniel <sip:Collins@station1workcom>
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INVITE sip:Collins@workcom SIP/20 Via: SIP/20/UDP pc1homenet; branch=z9hG4bK7890 Max-Forwards: 70 From: Boss<sip:Manager@homenet>; tag=ab12 Contact: Boss <sip:manager@pc1homenet> To: Daniel<sip:Collins@workcom> Call-ID: 123456@pc1homenet CSeq: 1 INVITE
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SIP/20 100 Trying Via: SIP/20/UDP pc1homenet; branch=z9hG4bK7890 From: Boss<sip:Manager@homenet>; tag=ab12 To: Daniel<sip:Collins@workcom> Call-ID: 123456@pc1homenet CSeq: 1 INVITE
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INVITE sip:Collins@station1workcom SIP/20 Via: SIP/20/UDP serverworkcom; branch=z9hG4bKxyz1 Via: SIP/20/UDP pc1homenet; branch=z9hG4bK7890 Max-Forwards: 69 Record-route: <sip:serverworkcom;lr> From: Boss<sip:Manager@homenet>; tag=ab12 Contact: Boss <sip:manager@pc1homenet> To: Daniel<sip:Collins@workcom> Call-ID: 123456@pc1homenet CSeq: 1 INVITE
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SIP/20 200 OK Via: SIP/20/UDP serverworkcom; branch=z9hG4bKxyz1 Via: SIP/20/UDP pc1homenet; branch=z9hG4bK7890 Record-route: <sip:serverworkcom;lr> From: Boss<sip:Manager@homenet>; tag=ab12 To: Daniel<sip:Collins@workcom>; tag=xyz45 Call-ID: 123456@pc1homenet CSeq: 1 INVITE Contact: sip:Collins@station1workcom
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SIP/20 200 OK Via: SIP/20/UDP pc1homenet; branch=z9hG4bK7890 Record-route: <sip:serverworkcom;lr> From: Boss<sip:Manager@homenet>; tag=ab12 To: Daniel<sip:Collins@workcom>; tag=xyz45 Call-ID: 123456@pc1homenet CSeq: 1 INVITE Contact: sip:Collins@station1workcom
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ACK sip:Collins@station1workcom SIP/20 Via: SIP/20/UDP pc1homenet; branch=z9hG4bK7891 Max-Forwards: 70 Route: <sip:serverworkcom;lr> From: Boss<sip:Manager@homenet>; tag=ab12 To: Daniel<sip:Collins@workcom>; tag=xyz45 Call-ID: 123456@pc1homenet CSeq: 1 ACK
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ACK sip:Collins@station1workcom SIP/20 Via: SIP/20/UDP serverworkcom; branch=z9hG4bKxyz2 Via: SIP/20/UDP pc1homenet; branch=z9hG4bK7891 Max-Forwards: 69 From: Boss<sip:Manager@homenet>; tag=ab12 To: Daniel<sip:Collins@workcom>; tag=xyz45 Call-ID: 123456@pc1homenet CSeq: 1 ACK
already been processed at the proxy In other words, the fact that a proxy has received a request with a Via: header field indicating the proxy itself does not necessarily mean that a loop condition does exist, just that it might exist Examination of the REQUEST-URI and the other header fields is needed to be certain
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The Session Initiation Protocol (SIP)
The Session Initiation Protocol (SIP)
For example, assume a request had been processed at a proxy and that request led to a certain routing that ultimately led back to the proxy A loop condition would exist here only if the proxy would forward the request the same way both the first time and the second time On the other hand, if the request had been modified such that the proxy would route the request differently the second time it arrives, then we have a spiral condition and not a loop condition A spiral condition is not an error In the event that a loop exists, the proxy can respond to the request with status code 482 (loop detected) Otherwise, the proxy will pass the request onwards after inserting its own address in a new Via: header field Responses also include Via: header fields, which are used to send a response back through the network along the same path that the request used (in reverse, of course) When a server responds to a request, the response contains the list of Via: headers exactly as received in the request When a proxy receives a response, the first Via: header should refer to itself If it does not, a problem has occurred and the message is discarded Assuming that the first Via: header field indicates the proxy itself, then the proxy removes the header and checks to see if a second Via: header exists If not, then the message is destined for the proxy itself If there is a second Via: header field, then the proxy passes the response to the address in that field In this way, the response finds its way back to the originator of the request along the path that was originally taken by the request Note that the Via: header in the example of Figure 5-12 contains a branch parameter In the original RFC 2543, the primary objective of the branch parameter was to distinguish between multiple responses to the same request As we shall describe shortly in a discussion regarding forking, a proxy might forward a single request to multiple destinations In such an event, multiple responses might be received and those need to be distinguished In the latest SIP specification (as of this writing), greater significance is applied to the branch parameter Specifically, the branch parameter is used to uniquely identify a transaction created at a given entity (such as a proxy) and assists in the recognition of loop conditions Thus, the branch parameter must be unique Moreover, the latest SIP specification requires that the branch parameter begin with the characters z9hG4bK, which is known as the magic cookie This strange set of characters at the beginning of the branch parameter indicates that a client or server complies with the latest SIP specification, rather than the base RFC 2543 In the base RFC 2543 specification, the branch parameter is optional and does not uniquely identify a transaction Consequently, if a proxy receives a request with a Via: header and the branch parameter, it will only assume that the branch
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The Session Initiation Protocol (SIP)
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