Patent ID: 7170888
Filing Date: 2007-01-30
Classification: H04L,H04Q

Abstract:
1. A call control method between a packet network and Public Switched Telephone Networks (PSTNs) in a next generation network; the method comprising: for the inter-operation between the packet network and the PSTN, setting up a virtual continuity (COT) check in an ISDN User Part ISUP) call processing and transmitting an Initial Address Message (IAM); receiving the IAM, conducting the number translation of the call receiving number, determining a terminating media gateway and a terminating PSTN at the same time as determining a trunk and notifying the terminating media gateway of the reservation of the trunk; transmitting the IAM with the COT check set-up to the terminating PSTN, after setting up the COT check in the IAM; and conducting the bearer connection set-up based upon the bearer set-up request of the packet network, including in COT message whether the COT check has been completed depending on the result of the bearer connection set-up and transmitting the COT message.