Patent ID: 7921157

Claim:
A method of transmitting data units to participants of a conference using a switch, the method comprising: receiving, at the switch, a first data unit from a first conferencing participant, the first data unit addressed to the switch and including a payload portion; forwarding, by the switch, the first data unit to at least a second conferencing participant and a third conferencing participant by: generating a first and a second duplicated data unit by duplicating at least a portion of the payload portion of the first data unit and adding header information to reflect destination address information, wherein duplicating at least a portion of the payload portion of the second data unit includes: identifying a portion of the payload portion that is not suitable for the third conferencing participant; filtering the payload portion of the second data unit by removing the portion that is not suitable for the third conferencing participant; duplicating a remaining portion of the payload portion of the second data unit for transmission to the third conferencing participant; transmitting the first duplicated data unit to the second conferencing participant and transmitting the second duplicated data unit to the third conferencing participant; receiving, at the switch, a second data unit from the second conferencing participant; and forwarding, by the switch, the second data unit to at least the first conferencing participant and the third conferencing participant.