v=0 0=userB 12345 001 IN IP4 stationBnetworkcom in Visual Studio .NET

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For each of the status types, we can indicate whether the status relates to the end-to-end (e2e) resource reservation, local resource reservation, or remote resource reservation Recall that resource reservation can be on a session-by-session basis or on an aggregate basis In the case of per-session resource reservation, resources must be reserved end to end as part of the session establishment In the case of aggregate reservation, each end must check that it is allowed to access the reserved aggregate resources at its end (local) Moreover, each end must ensure that the far end has also been granted access (remote) In addition to the status type (e2e, local, or remote), we must also specify whether the reservation is for sending media, receiving media, or both Finally, when requesting that the far end reserve resources, we can use a strength tag to indicate whether the reservation is optional or mandatory Example SDP Description for the Initial INVITE Referring again to Figure 5-22, let s look at examples of the media portions of the SDP descriptions that would be associated with the signaling exchange Here is an example of an SDP description for the initial INVITE:
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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 e2e none a=des: qos mandatory e2e sendrecv
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This SDP description indicates that User A wants to use G711 m-law voice The description includes QoS-related preconditions, which specify that the current QoS is such that no end-to-end reservation has taken place The desired precondition is that mandatory end-to-end resource reservation be in place for both the sending and receiving of media Example SDP Description for the 183 (Session Progress) Response This description is almost identical to that of the initial INVITE, with the exception of User-B-specific address and port information as well as the addition of the confirmation attribute The confirmation attribute indicates that User B wants User A to reserve resources in the direction from User A to User B (which is the receive direction from User B s perspective) User B will separately reserve resources in the User-B-to-User-A direction
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The Session Initiation Protocol (SIP)
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The Session Initiation Protocol (SIP)
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s= c = IN IP4 stationBnetworkcom t=0 0 m=audio 6666 RTP/AVP 0 a=curr: qos e2e none a=des: qos mandatory e2e sendrecv a=conf: qos e2e recv
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Example SDP Description for the UPDATE Request This SDP description indicates that User A has performed his part of the task; resources are reserved in the direction from User A to User B
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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 e2e send a=des: qos mandatory e2e sendrecv
Example SDP Description for the 200 (OK) Response to the UPDATE Request This SDP description indicates that the current QoS status and desired QoS status are the same In other words, resource reservation has taken place in both directions The call can now proceed
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 e2e sendrecv a=des: qos mandatory e2e sendrecv
The foregoing description looks at resource reservation on an end-to-end basis On the other hand, network resources might have already been reserved on an aggregate basis In such a case, each end simply needs to verify with a local policing function that it is allowed access to available resources The approach is to use status types that are segmented (local and remote) as opposed to end to end, which means that each participant deals with network access permission at its own end The signaling flow for such a scenario would be as shown in Figure 5-23 In Figure 5-23, User A requests access to network resources in advance of sending the INVITE Assuming that access permission has been granted, then the INVITE message body indicates that local send and receive
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The Session Initiation Protocol (SIP)
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