System and method for transferring a call

摘要

System comprising: a first station; a second station establishing a first communication session with the first station, the first communication session having a first connection identifier identifying the first communication session; a third station; and a network device containing stored data indicative of a relationship between the first station and the third station, wherein the network device is configured to obtain the first connection identifier from the first station and to transmit the first connection identifier to the third station on the relationship, wherein the third station is configured to receive the first connection identifier and to send an invitation to the second station to replace the first communication session with the first station by a second communication session with the third station, the invitation including the first connection identifier and a first connection identifier contains second connection identifier identifying the second communication session.