Resumen

MORENO, Carlos  y  ALVAREZ, Maribel. IMPROVEMENT OF THE RESPONSE TIME IN A NEW MULTICAST ARCHITECTURE FOR AUDIOCONFERENCES BASED ON SIP EXTENSIONS AND GROUP MANAGEMENT. Rev. Fac. Ing. UCV [online]. 2012, vol.27, n.1, pp.18-30. ISSN 0798-4065.

Group services like the audioconference require a minimum level of quality of service for the adequate transmission of multimedia packets, and the improvement of signaling processes for the establishment, maintenance and release of multicast group sessions. Traditionally, the SIP (Session Initiation Protocol) servers have dealt with unicast signaling, and complementary support IP (Internet Protocol) multicast . The distribution patterns of the session are described on the SDP (Session Description Protocol) payload. As a consequence, the same existing drawbacks of IP multicast affect the performance of SIP-based requested audioconferences. This work proposes and improves a new multicast architecture based on SIP extensions and a group management system. Such architecture supports overlay multicast in both data and control plane. The group management functions are executed inside a conference manager. Two testbeds were mounted to measure the joining and leaving time for both IP multicast and SIP multicast with several levels of extra load traffic from a potential group member to the source of multimedia traffic. The results show that the difference between the minimun and maximun standard deviation value for both joining and leaving time on the architecture proposed with SIP multicast is lower than with IP multicast for the studied scenarios

Palabras clave : Audioconference; Multicast; Signaling; SIP; Response.

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