Patent ID: 8930768
Filing Date: 2015-01-06
Classification: H04L

Abstract:
1. A method comprising: sending, from a first SIP device to a second SIP device, an initial Session Initiation Protocol (SIP) message to establish a first SIP communication session, wherein the initial SIP message is sent via a first one of a plurality of session managers; receiving the initial SIP message at second SIP device; after receiving the initial SIP message at the second SIP device and before ending the first SIP communication session, either the first or second SIP device sending a second SIP message, wherein the second SIP message is sent to the first one of the plurality of session managers; after the initial SIP message is received at the second SIP device, detecting in either the first or second SIP devices that a response SIP message to the sent second SIP message was not received within a defined time period; and in response to detecting that the SIP response message was not received within the defined time period, either the first or second SIP device resending the second SIP message to a second one of the plurality of session managers.