Patent ID: 8406123
Filing Date: 2013-03-26
Classification: G06F,H04L

Abstract:
1. A method for SIP presence server failover, the method comprising: setting an expiration time of a SIP application session on a first SIP server having a first SIP presence server to match the expiration time of a SIP request that is associated with said SIP application session; wherein said SIP request comprises one of the set consisting of a SIP publish request and a SIP subscribe request; setting a SIP request attribute set representing a plurality of attributes of said SIP request for reestablishing said SIP request; wherein for a SIP publish request and a SIP subscribe request said attribute set comprises a type of request, an event header, a from header and a to header; wherein for a SIP subscribe request the attribute set further comprises a subscribe list, a subscribe type and a version number of the most recent NOTIFY message sent for the subscription, said subscribe list comprising a URI list; replicating said SIP application session together with said attribute set and at least one object related thereto to a second SIP server having a second SIP presence server, wherein said related object comprises a timer; migrating said SIP application session to said second SIP server for activation thereat, wherein said migrating includes migrating said SIP application session together with said related object; detecting an event indicating that said SIP application session has been migrated; and upon detection of said event, reestablishing said SIP request associated with said SIP application session at said second SIP presence server using said migrated SIP application, said attribute set and said related object.