Patent ID: 11968266
Assignee: RIBBON COMMUNICATIONS OPERATING COMPANY, INC.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC G  H

Claim 10:
11. The method of claim 1,
wherein the first client communications device is a first mobile phone;
wherein said loss of the connection between the first client communications device and the first communications server results from a failure of the first communications server, said loss of the connection between the first client communications device and the first communications server causing a loss of a signaling control path but not causing a loss of a data communications path between the first client communications device and the second client communications device;
wherein said second communications server is a replacement communications server for the first communications server which had established said communications session between the first client communications device and the second client communications device, said established communications session being an on-going communications session when the loss of the connection between the first client communications device and the first communications server occurred; and
wherein said stored session state information includes session control information for the on-going established communications session between the first client communications device and the second client communications device, said session state information being required for the replacement communications server to maintain the on-going communications session between the first client communications device and the second client communications device following said loss of the connection between the first client communications device and the first communications server.