Managing session initiation protocol subscription dialog state loss

摘要

Managing Session Initiation Protocol (SIP) subscription dialog state loss, including a SIP server locator configured to determine the identity of a SIP server that maintains a SIP subscription dialog corresponding to a SIP subscription dialog that is maintained by a SIP client, and a liveliness tester configured to periodically send to the SIP server a SIP RE-SUBSCRIBE message corresponding to the SIP subscription dialog.