For providing the methods, devices and systems of calling transfer service in a communication network

For providing the methods, devices and systems of calling transfer service in a communication network

  • CN 101,779,443 B
  • Filed: 07/23/2008
  • Issued: 06/15/2016
  • Est. Priority Date: 07/30/2007
  • Status: Active Grant
First Claim
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1. the method for providing calling transfer service in a communication network, wherein between first user equipment UE a and the second user equipment (UE) b, establish the first calling via first server AS1, and wish that described second subscriber equipment initiating the calling transfer to the 3rd user equipment (UE) c is via second server AS2 the second calling being based upon between itself and described 3rd subscriber equipment, said method comprising the steps of:

  • When described first server receives the call transfer request from described second subscriber equipment so that when described first user equipment can communicate with described 3rd subscriber equipment, it is determined that whether described first server has and the information of described second call matches;

    AndWhen determining that described first server does not have the information with described second call matches, AS1 sends INVITE to UEa, receives OK message from UEa, thus obtaining Session Description Protocol (SDP) information of UEa;

    AS1 sends new INVITE to CSCF (CSCF) server, this new INVITE includes the new SDP information replacing head, submitter'"'"'s head and UEa, INVITE is routed to AS2 by CSCF, AS2 sends new INVITE to UEc, UEc returns OK message to AS2, thus sending the SDP information of UEc to AS2, AS2 to pass it to AS1 via CSCF after the SDP information obtaining UEcSo that described first user equipment can communicate via described first server with described 3rd subscriber equipment, the message instruction calling transfer wherein sent from described first server to described second server is submitted to by described second subscriber equipment.

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