Application-Layer QoS Interdomain Signalling with SIP Protocol

The QoS signalling across multiple domains is an open issue: in this paper we propose a QoS interdomain signalling solution for SIP-based multimedia sessions. Our solution refers to a signalling architecture proposed by ETSI in which the interdomain QoS signalling flows on the application layer along with the session signalling. In our solution we extend the precondition set attributes defined in the “Integration of Resource Management and Session Initiation Protocol (SIP)”, RFC 3312, to allow the exchange of information about resources required by multimedia sessions and local availability of resources in each domain, between all the domains along multimedia session paths. Moreover in this paper we provide a signalling solution that integrates interdomain signalling and SIP end-to-end session negotiation signalling.