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We will, therefore, limit the discussion of QoS for SIP only for the simple case where the AAA issues can be ignored SIP enables user agents to establish sessions using the INVITE/200/ACK exchange However, in order to establish an IP session with QoS, a more complicated message exchange is required The Integrated Services QoS protocol assumed in these examples is the Resource Reservation Protocol (RSVP) [19] However, the approach described here for SIP will also work with other QoS approaches, such as setting the type of service (TOS) bits in the IP header used in DiffServ [20] A simplified approach to QoS would be to first establish a best-effort session between user agents, then use a re-INVITE to set up the new QoS session.

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However, since the SIP messaging is completely independent of the media, it is entirely possible to successfully set up a session using SIP, only to have the session fail because of lack of bandwidth for the media, in which case this approach will fail Also, there was a desire to mimic the behavior in the PSTN, where the called party s phone will not ring if there are not sufficient resources (that is, trunks) to complete the call if answered The approach described here was developed by the PacketCable consortium [21] for the Voice over Cable Modem project The call flow is shown in Figure 69 This call flow makes use of three extensions to SIP The first is Early Media [22], which allows SDP to be present in the provisional 183 Session Progress response.

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This allows an addition media (SDP) handshake between the user agents necessary to establish the QoS prior to the call being answered The second is the Reliable Provisional Responses extension to SIP, which allows a lost provisional response such as a 183 to be detected and retransmitted (see the sidebar Message Retransmissions in SIP ) The receipt of the 183 response is indicated by the PRACK (Provisional Response ACKnowledgement) [23] message The third extension is the use of the COMET (preCOnditions MET) [24] method, which allows the UAS to indicate the QoS preconditions.

In distribution networks, the central earth station, sometimes called the "hub" is, in principle, a transmit-only station (although receive facilities are usually provided for control and network supervision) and the remote earth stations are receive-only (RO) stations (often called terminals). The distribution can be selective, i.e. addressed to a group of terminals (or even to a single one) or it can be received by any terminal in the coverage. It can be emphasized that the satellite is really a unique transmission medium for such services of the broadcast type. In particular, terrestrial packet switched networks cannot, at present, be configured for data broadcast using standardized protocols. There are many applications of satellite information distribution to RO terminals. For example, the operation of the global positioning system (GPS) is based on the reception, by small, handheld, terminals, of reference signals broadcasted by several orbiting satellites. Another example is offered by paging systems where dedicated signals are addressed to the users. Another important application is data distribution towards RO microstations or VSATs (very small aperture terminals). This is generally done in the framework of business communication networks and the distribution can be either general or restricted to closed users groups (subnetworks)19. But the main and most popular application of satellite distribution is the broadcasting of television programmes (or radio programmes) towards small and inexpensive TVRO stations, either for individual (DTH: direct-to-home) or for collective reception. There are now tens of millions of such TVROs throughout the world and the importance of this application is currently and very rapidly

Add97: priority for GMDSS (see WRC97 218)