Patent ID: 6987974

Claim:
Method for setting up a multimedia call between an originating or terminating mobile terminal and a corresponding terminating or originating nondigital public switched telephone network (PSTN) terminal via a mobile switching center (MSC) in a mobile telephone network, comprising the steps of: checking parameter values in backward or forward ISDN user part (ISUP) messages at said MSC for an indication of originating or terminating non-ISDN access by a PSTN local exchange (LE) connecting to said terminating or originating non-digital PSTN terminal, and setting up a compatible connection between said originating or terminating mobile terminal and said corresponding terminating or originating non-digital PSTN terminal via said MSC and said PSTN LE in the presence of said indication of said originating terminal or said terminating terminal connecting to said PSTN LE to support said multimedia call, wherein a data rate for said compatible connection is agreed by both the originating and the terminating terminals.