Abstract: To provide for interoperability of Session Initiation Protocol (SIP) and H.323 for Secure Realtime Transport Protocol session establishment, a transmit key is received in a first protocol from a first endpoint. The transmit key is mapped from the first protocol to a second protocol and sent in the second protocol to a second endpoint to establish a secure communication session between the first endpoint and the second endpoint.

Abstract: A conferencing system includes a mixer operable to process audio and video packets received from a plurality of endpoint devices, and to transmit a processed audio/video stream back to the endpoint devices. A server connects with the mixer and the endpoint devices. The server is operable to send a first transmission to a first endpoint device that causes the first endpoint device to stop transmitting video packets to the mixer. The server is further operable to send a second transmission to a second endpoint device that causes the second endpoint to start transmitting video packets to the mixer. It is emphasized that this abstract is provided to comply with the rules requiring an abstract that will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. 37 CFR 1.72(b).