Patent ID: 9661140
Date: 2017-05-23
CPC Classifications: H04M,H04Q,H04W

Claim:
1. A method for shifting an original call established between a first user device and a correspondent device through a first application server in order to route it through a second application server, the method comprising: receiving a notification that the original call is established between the first user device and the correspondent device through the first application server and sending an invitation to shift the call through the second application server; receiving a server shift instruction; instructing the first application server to forward the original call through the second application server to the first user device upon receiving the server shift instruction, the first application server being instructed to establish a three-way conference communication between the first user device, the correspondent device and the second application server in order to forward the original call from the first application server to the second application server; determining that an incoming call routed from the second application server to the first user device has an identification information which matches identification information of the original call; and causing the first user device to pick-up the incoming call routed from the second application server to the first user device and instructing to release the call branch between the first application server and the first user device upon determining that the identification information matches.