available Gigabit Ethernet switch supports neither Q- SIP/SDP session layer signaling or RSVP-TE network layer signaling, the QoS-aware customer network management (Q-CNM) for home/office intra network must provide the QoS-scheduling and the queue configuration func- tions with CAC. Figure 15.6 depicts the procedure of QoS-connectivity estab- lishment in an intranet with IEEE 802.1 11e Wireless LAN and Fast/Gigabit Ethernet switch. When a caller QoS-aware Station (QSTA) initiates a session establishment with an INVITE message, the Q-SIP/SDP proxy server firstly checks the location of the called party (callee), determines the next hop, and relays the Q-SIP/SDP message. When the callee accepts the request of session estab- lishment by replying with a 183 Session Progress message, the Q-SIP/SDP proxy server receives it, and sends a resource allocation request message to the Q-CNM that manages the intranet resources. Based on the CAC func- tion, the Q-CNM first checks the availability of the requested bandwidth in the Fast/Gigabit Ethernet switch, and confirms that the addition of the new QoS-connectivity does not deteriorate the QoS provisioning of the existing C 2009 by Taylor & Francis Group, LLC Q-SIP/SDP for Converged Heterogeneous Wired and Wireless Networks 361 flows. When the new QoS flow is admitted, the Q-CNM configures the QoS- scheduler and the strict priority queue. 15.3.4 Resource Reservation and CAC in IEEE 802.11e WLAN Guaranteed QoS provisioning on currently available IEEE 802.11 wireless LAN (WLAN) products is very limited, since the data delivery on most WLANs is based on contention-based medium access control, i.e., carrier sens- ing multiple access, collision avoidance (CSMA/CA). IEEE 802.11e [16] has been standardized to support QoS provisioning with an enhanced channel access mechanism: Enhance DCF Channel Access (EDCA) and HCF Con- trolled Channel Access (HCCA). The QoS provisioning on IEEE 802.11e is based on the enhanced distributed channel access by EDCA and the cen- tralized channel access