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(iv) Bob s SIP Proxy determines Bob s current contact address, resolves it into a routable address, eg by DNS look-up, includes an additional Via header eld containing its own address and forwards the INVITE to Bob s current device (v) Bob s SIP Proxy replies to Alice s SIP Proxy that it is trying to forward the INVITE (vi) Bob s User Agent can determine whether the current device can deal with the session description, eg whether it supports the suggested media and codecs Since it does, it alerts Bob, eg by ringing the phone It also informs the other nodes involved by generating a provisional response 180 RINGING, which is routed, via the SIP Proxies, to Alice s User Agent Each proxy uses the Via header eld in order to determine where to send the response and removes its own Via address from the header.

Note that all devices announce their data reservations, and each device s beacon slot contains information on all other devices [1] Since the beacon period varies, the available number of data packet slots for PCA transmissions, C, also varies, depending on the number of active devices in the system In Figure 126, active devices 2 and 3 are transmitting DRP packets, while PCA devices 1 and 4 can transmit in the PCA periods PCA is similar to IEEE 80211e using CSMA/CA, except that suf cient time to transmit a packet must be available before the next DRP block or BP, and there is a timeout for retrying to transmit The timeout for retrying has an effect similar to having a retry limit.

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(vii) Bob accepts the invitation His User Agent generates a 200 OK response which is routed backwards to Alice s User Agent, in the same way as the previous 180 RINGING message The transaction initiated by the INVITE message is now closed (viii) Alice s User Agent acknowledges the successful conclusion of the signalling exchange Now that contact addresses have been exchanged, the ACK is sent directly to Bob Finally, the multimedia session can be held Note that the ACK request is the exception to the transaction rule: it always follows a successful INVITE transaction and never generates a response (ix) Alice stops the session, her User Agent sends a BYE to Bob s User Agent (no header elds shown) (x) Bob s User Agent closes the transaction with a 200 OK message (no header elds shown).

Hard and soft DRPs differ from each other in that no one else can use the reserved slots for hard DRPs, while PCA can use the reserved slots for soft DRPs if they are not used Therefore, there are more time slots for PCA usage under soft DRPs than that under hard DRPs In other words, soft DRPs allow PCA to share its reserved slots if they are not utilized, while hard DRPs allow no sharing of their reserved slots at all There are four traf c classes (access categories) in PCA, and one method of differentiating the priority of each class is based on its arbitration interframe space (AIFS) The shorter the AIFS and the smaller the minimum and maximum contention window sizes of the traf c class, the higher the priority.

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It is instructive to compare the routing of SIP messages to the routing of RSVP or QoS NSLP messages (cf 14, Section 1422): Each of these protocols must solve the backwards routing problem , ie the rst signalling message travels from a sender to a receiver, thereby visiting a number of intermediate nodes (SIP Proxies in the case of SIP, RSVP routers in the case of RSVP, QoS NSLP Elements in the case of QoS NSLP) Subsequent messages may travel in the opposite direction, from the receiver to the initial sender of the message These messages must visit the same intermediate nodes RSVP and QoS NSLP solve this problem by installing backwards routing state in the intermediate nodes SIP solves this problem by carrying the full set of intermediate routers in each backwards travelling message.