such as IP/MPLS or IP/WDM transit network, vDSL, or PON access loop, and IEEE 802.3 Giga- bit/Fast Ethernet or IEEE 802.11 wireless LAN (WiFi) home/office intranet, will be integrated [1]. Each subnetwork may have a different signaling mech- anism for connection establishment or resource reservation with connection admission control (CAC). Figure 15.1 shows the end-to-end session layer sig- naling and per-domain subnetwork management for QoS-guaranteed multi- media service provisioning. The IP/MPLS or IP/WDM backbone transit network will be equipped with (G)-MPLS signaling, such as RSVP-TE, that provides constraint-based LSP (label switched path) establishment in the MPLS network domain. The transit network may be implemented by DiffServ-over-MPLS virtual overlay networks, in order to efficiently provide QoS-guaranteed differentiated multi- media services. The access network interconnects commercial backbone transit network and home/office intranet. Currently, most access loops are implemented by vDSL or PON technologies that provide a fixed bandwidth channel. Since most access loops do not include packet switching functions, bandwidth- guaranteed channel allocation with simple CAC is a practical scheme for the QoS-guaranteed multimedia service provisioning in the access loop. The IEEE 802.3 Fast/Gigabit Ethernet and IEEE 802.11 wireless LAN (WiFi) are the most popular home/office intranet technologies because of the simplicity and low installation cost. The CSMA/CD-based Ethernet and CSMA/CA-based WiFi, however, are contention-oriented networking technol- ogy where bandwidth and QoS cannot be guaranteed by itself. Well-designed © 2009 by Taylor & Francis Group, LLC SIP Handbook: Services, Technologies, and Security Q-SIP proxy Q-SIP proxy Q-SIP proxy Q-SIP proxy server server End-to-End QoS server server signaling using Q-SIP/SDP Q-CNM AN NMS BB NMS BB NMS AN NMS Q-CNM Home/office Access network Access network Home/office Backbone network management Intra network management management Intra network IEEE 802.11 I