qr code c# example Figure 5-23 Session establishment with local and remote resource verification in .NET

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Figure 5-23 Session establishment with local and remote resource verification
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Local resource reservation a INVITE v=0 0=userA 45678 001 IN IP4 stationAnetworkcom s= c = IN IP4 stationAnetworkcom t=0 0 m=audio 4444 RTP/AVP 0 a=curr: qos local sendrecv a=curr: qos remote none a=des: qos mandatory local sendrecv a=des: qos mandatory remote sendrecv Local resource reservation b SIP/20 180 Ringing v=0 0=userB 12345 001 IN IP4 stationBnetworkcom s= c = IN IP4 stationBnetworkcom t=0 0 m=audio 6666 RTP/AVP 0 a=curr: qos local sendrecv a=curr: qos remote sendrecv a=des: qos mandatory local sendrecv a=des: qos mandatory remote sendrecv c PRACK (for 180 response)
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resources are available, but that remote resources are not yet known to be available Upon receipt of the INVITE, User B requests access to resources at the called end Once access is granted, User B can proceed to alert the called party and returns a 180 (ringing) response to User A That response contains a message body that indicates that the necessary resources are available at User B s end The 180 (ringing) response is sent reliably Since both ends have verified access to network resources, the call can proceed
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The Session Initiation Protocol (SIP)
The Session Initiation Protocol (SIP)
In the foregoing descriptions, mandatory strength means that the session cannot continue unless the required resources are definitely available Optional strength means that the receiver of the session description should reserve resources and proceed with the call, but the resource reservation is not an absolute requirement Strength of none is the initial situation and indicates that no effort to reserve resources has yet taken place The strength value of failure also exists and would be included in a message body in the event that resource reservation did not succeed This value would be returned in a 580 (precondition failure) response, which is a new response that is included as part of the resource reservation extension to SIP Note that, in the event that resources cannot be reserved, the decision not to complete a call might be made only as a last resort, even if the reservation is mandatory If sufficient resources cannot be used, the option to select a lower-bandwidth codec to reduce the resource requirements is always available This avenue should be explored before refusing to establish a call However, it can only be explored if each end supports a lowerbandwidth codec than their first choice Moreover, a lower-bandwidth codec often means lower speech quality, something that needs to be seriously considered before assuming that a lower-bandwidth codec is really an option
Usage of SIP for Features and Services
A number of SIP messaging scenarios have already been described in this chapter, and most of them have described fairly straightforward call scenarios We have also seen a number of extensions to SIP In fact, one of the great advantages of SIP is the fact that it enables the easy addition of backwards-compatible extensions Another great advantage of SIP is the fact that it can be used to provide a number of advanced features and services For example, we have already seen how the REFER method can be used for a call-transfer application We have also seen that SIP inherently supports personal mobility through the use of registration We have seen how a forking proxy can enable a one-number service and we have also seen how the Retry-After: header can be used to support call-completion services In many ways, these are just the tip of the iceberg when it comes to the features that SIP can offer It is possible for SIP messages to carry MIME content as well as an SDP description Therefore, a response to an INVITE could include a piece of
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The Session Initiation Protocol (SIP)
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