qr code c# example The SIP UPDATE Method in .NET framework

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initial value of RSeq chosen the first time that a given response is returned is a random number between 1 and 2,147,483,647 Each time the response is retransmitted, the value of RSeq is incremented by 1 The provisional response also includes the Require: header containing the 100rel option tag The PRACK sent by the client contains the RAck header, which contains two components The first component is the value of the RSeq copied from the provisional response for which the PRACK is being sent The second is a CSeq number and method token copied from the response for which the PRACK is being issued The process is shown in Figure 5-21 In this example, the calling client uses the Supported: header to indicate in the INVITE that it supports the acknowledgment of provisional responses The first 180 (ringing) response to the INVITE is lost After a timeout, the server retransmits the response Note that both instances of the response include the RSeq: header, but that the value has been incremented in the second instance of the response Upon receipt of the retransmitted response, the calling client acknowledges the response through the use of the PRACK method This contains the RAck: header field The content of the field is the value received in the RSeq: header of the response, plus the content of the CSeq: header in the response Finally, the server confirms receipt of the PRACK by issuing a 200 (OK) response Note that this 200 (OK) response relates to the PRACK and not to the initial INVITE Although reliability may be applied to provisional responses, it must not be applied to the 100 (trying) response and the RSeq: header should not be included in such a response The 100 (trying) response is sent on a hop-byhop basis, whereas the reliability mechanism described in this extension is end to end and does not apply to the 100 (trying) response
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The SIP UPDATE Method
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As already described in this chapter, a SIP session is established with an INVITE The far-end response to the INVITE will include a tag parameter and will lead to the establishment of a dialog Depending upon whether the response is a provisional (1XX) response or a final (2XX) response, the dialog is either early or confirmed If something about the session needs to change (the codecs being used, for example), then a re-INVITE can be issued One problem with this approach, however, is that the reissuance of an INVITE changes the state of the dialog A re-INVITE within an established session (one that has a confirmed dialog) will generally work well as a means of changing session
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The Session Initiation Protocol (SIP)
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The Session Initiation Protocol (SIP)
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ClientA@networkcom
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ServerB@networkcom
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Figure 5-21 Reliability for provisional response
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a INVITE sip:ServerB@networkcom SIP/20 Via: SIP/20/UDP ClientAnetworkcom; branch=z9hG4bK7890123 Supported: 100rel Require: 100rel From: sip:ClientA@networkcom; tag=lmnop123 To: sip:ServerB@networkcom Call-ID: 123456@ClientAnetworkcom CSeq: 1 INVITE b
SIP/20 180 Ringing Via: SIP/20/UDP ClientAnetworkcom; branch=z9hG4bK7890123 Require: 100rel RSeq: 567890 From: sip:ClientA@networkcom; tag=lmnop123 To: sip:ServerB@networkcom; tag=xyz123 Call-ID: 123456@CientAnetworkcom CSeq: 1 INVITE SIP/20 180 Ringing Via: SIP/20/UDP ClientAnetworkcom; branch=z9hG4bK7890123 Require: 100rel RSeq: 567891 From: sip:ClientA@networkcom; tag=lmnop123 To: sip:ServerB@networkcom; tag=xyz123 Call-ID: 123456@CientAnetworkcom CSeq: 1 INVITE
Response Lost
Response Retransmit
d PRACK sip:ServerB@networkcom SIP/20 Via: SIP/20/UDP ClientAnetworkcom; branch=z9hG4bK7890123 RAck: 567891 1 INVITE From: sip:ClientA@networkcom; tag=lmnop123 To: sip:ServerB@networkcom; tag=xyz123 Call-ID: 123456@CientAnetworkcom CSeq: 2 PRACK e SIP/20 200 OK Via: SIP/20/UDP ClientAnetworkcom; branch=z9hG4bK7890123 From: sip:ClientA@networkcom; tag=lmnop123 To: sip:ServerB@networkcom; tag=xyz123 Call-ID: 123456@CientAnetworkcom CSeq: 2 PRACK
data such as media parameters A re-INVITE for an early dialog, however, cannot be used for the same purpose Consider, for example, an INVITE that receives a 183 (session progress) response that includes a message body That message body might establish a media stream from callee to
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The Session Initiation Protocol (SIP)
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