Patent ID: 7990879

Claim:
A method for supporting a conference link for communication between two or more endpoints, comprising steps of: initiating the conference link between the two or more endpoints, said conference link transmitting both video and audio; establishing, at one of the two or more endpoints, an ISDN (Integrated Services Digital Network) audio-only link between the two or more endpoints when initiating the conference link, wherein said conference link transmits both video and audio simultaneously and in parallel with said audio-only link transmitting only audio; monitoring, at one of the two or more endpoints, the conference link for predefined errors or events; switching, at one of the two or more endpoints, communication from the conference link to the ISDN audio-only link when one or more of said predefined errors or events is detected in the conference link; switching, at one of the two or more endpoints, the communication from the ISDN audio-only link back to the conference link when detected errors or events in the conference link have disappeared or when the conference link is re-established; and discarding data at an output of a transmitting end-point when the ISDN audio-only link is not in use.