A Call Server Integrated Approach for QoS Provisioning of SIP Multimedia Services in 802.11 Wireless Networks

In current 802.11 wireless networks, the Quality of Service (QoS) of Session Initiation Protocol (SIP) multimedia services may be affected by other best-effort services. Moreover, the IP/port information of a SIP multimedia service is dynamically allocated and not easily identified. To solve the above problems, this paper proposes a call server integrated approach where we assign the high-priority Service Set Identifier (SSID) to SIP multimedia services and retrieve the IP/port information from the Session Description Protocol (SDP) of SIP signaling messages to recognize the flows of the multimedia services. The proposed approach can be easily deployed in current 802.11 wireless networks.