Inspec keywords: multimedia communication; redundancy; protocols; wide area networks; computer network reliability; fault tolerance; telecommunication control; performance evaluation

Other keywords: state-sharing design; testbed experiments; 3GPP IMS; fault-tolerant call control system; session initiation protocol; SIP-based call control system; system reliability improvement; WAN environment; multimedia sessions

Subjects: Reliability; Multimedia communications; Maintenance and reliability; Protocols; Protocols; Computer network performance; Other computer networks; Computer communications; Multimedia