Table of Contents
1Scope
2References
3TermsandDefinitions
4AbbreviationsandAcronyms
5SS-COServiceDescription
5.1NormalProcedures
5.2ExceptionalProcedures
5.3Interactionswithothersupplementaryservices
6Messagesandinformationelements
7SignallingProcedures
7.1ActionsatUserA'sEndpoint
7.2ActionsatUserB'sEndpoint
8InterworkingandInteractions
8.1InterworkingwithSCN
8.2ProtocolinteractionbetweenSS-COandotherSupplementary
Services
9Gatekeeper/ProxyActions
9.1GatekeeperpassesonSS-COoperationstotheendpoint
9.2Gatekeeper/proxyactsonbehalfofanendpoint
10DynamicDescription
10.1OperationalModel
10.2SignallingFlows
10.3CommunicationbetweenanendpointAsignallingentity
(EASE)anditsSignallingentityuser(informative)
10.4CommunicationbetweenanendpointBsignallingentity
(EBSE)anditssignallingentityuser(informative)
10.5Callstates
10.6Timers
11OperationsinsupportofCallOffersupplementaryservice
12SpecificationandDescriptionLanguage(SDL)DiagramsforSS-CO
12.1BehaviourofuserA'sendpoint
12.2BehaviourofuserB'sendpoint Abstract
Describes the procedures and the signalling protocol for the Call Offering supplementary service in H.323 (Packet Based Multimedia Communications Systems) networks. The Call Offer supplementary service (SS-CO) enables a calling user A, encountering a busy destination user B, to "camp-on" to the busy user. This means that the call is indicated to user B and kept in a waiting state until user B reacts to the indication, rather than being released due to the busy condition.
