Patent ID: 9350872
Filing Date: 2016-05-24
CPC Classification: H04L,H04M,H04W

Claim Text:
1. A method of re-establishing a messaging session comprising: receiving short message service (SMS) messages initiation request at a Session Initiation Protocol (SIP) proxy wherein a first SMS message from a messaging device is received using Short Message Peer-to-Peer (SMPP) from a given source (MSISDN); directing, from the SIP proxy, establishment of a session leg associated with the messaging session between an initial emergency call answer node and an operator workstation wherein subsequent messages from the messaging devices are send to the operator workstation while the session is established; directing, from the SIP proxy, establishment of a session leg for the messaging session between the initial emergency call answer node and an emergency call gateway; detecting at the SIP proxy a failure of the initial emergency call answer node by monitoring a heartbeat signal between the SIP proxy and the initial emergency call answer node; transmitting from the SIP proxy a SIP session establishment request to a second emergency call answer node; receiving the SIP session establishment request at the second emergency call answer node, the session establishment request having an indication of the previously established messaging session between an operator workstation and the messaging device to be re-established; checking a recovery queue at the second emergency call answer node for a previously received messaging session establishment request having a matching indication for the previously established messaging session to re-establish; and bridging at the second emergency call answer node a session leg for the received messaging session establishment request and the session leg for the previously received messaging session establishment request having the matching indication for the previously established messaging session to re-establish the messaging session between the operator workstation and messaging device when a match is found between the SIP proxy and the operator workstation.