EP 1897321 A1 20080312 - METHOD FOR CONTROLLING THE USER FACILITY "SIP CALL-TRANSFER"
Title (en)
METHOD FOR CONTROLLING THE USER FACILITY "SIP CALL-TRANSFER"
Title (de)
VERFAHREN ZUR STEUERUNG DES LEISTUNGSMERKMALS "SIP CALL-TRANSFER"
Title (fr)
PROCEDE POUR COMMANDER LA FONCTION "TRANSFERT D'APPEL SIP"
Publication
Application
Priority
- EP 2006062843 W 20060601
- DE 102005027231 A 20050613
Abstract (en)
[origin: WO2006134034A1] In prior art, according to the ITU-T recommendation Q.1912.5, chapter 6.1.1 (1)(a), to implement the user facility IP call transfer , if SIP preconditions are not in use, the media gateway controller (I-IWU) only sends the ISUP message IAM to a called (third) subscriber upon receipt of the SDP data. However, said procedure has definitive disadvantages in terms of additional memory requirements in the media gateway controller, leading to call delays. The invention solves the problem in the following way: the IAM message, together with the ISUP protocol element continuity check on previous circuit are transmitted to the ISUP subscriber and the bearer connection is only established upon receipt of the SDP data from the A-side.
IPC 8 full level
H04L 29/06 (2006.01)
CPC (source: EP)
H04L 65/1083 (2013.01); H04L 65/1104 (2022.05); H04M 3/58 (2013.01); H04M 7/1255 (2013.01)
Citation (search report)
See references of WO 2006134034A1
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2006134034 A1 20061221; CN 101248641 A 20080820; EP 1897321 A1 20080312; JP 2008544597 A 20081204
DOCDB simple family (application)
EP 2006062843 W 20060601; CN 200680021028 A 20060601; EP 06763464 A 20060601; JP 2008515201 A 20060601