A bridge system for handling and conducting a multimedia multipoint conference between media relay endpoints and legacy endpoints, the bridge system comprising: an Ethernet network (292, 345), configured to carry streams of transport frames according to a transport protocol; a control module (290, 330) connected to the Ethernet network (292, 345); a media relay processor (220, 240, 310), connected to the Ethernet network (292, 345) and configured to receive compressed media received from a first media relay endpoint over a network, to deliver one or more streams of packets toward a second media relay endpoint over the network, to deliver streams of transport frames to the Ethernet network (292, 345), and to receive streams of transport frames from the Ethernet network (292, 345), media payload of the compressed media received from the first media relay endpoint being embedded in the streams of transport frames; and a legacy processor (210, 230, 320), connected to the Ethernet network (292, 345), configured to receive compressed media received from a first legacy endpoint over the network, to deliver one or more streams of packets toward a second legacy endpoint over the network, to deliver streams of transport frames to the Ethernet network (292, 345), and to receive streams of transport frames from the Ethernet network (292, 345), media payload of the compressed media received from the first legacy endpoint being embedded in the streams of transport frames; wherein stream identifiers are allocated to the streams of transport frames, the allocated stream identifiers being added by the media relay processor (220, 240, 310) and the legacy processor (210, 230, 320) as part of a header of the transport frames and being used to mark the transport frames while the transport frames are traveling over the Ethernet network (292, 345), each stream identifier being associated with a multicast address for the stream; wherein the Ethernet network (292, 345) is controlled by an Ethernet switch having multicast routing capabilities; and wherein the media relay processor (220, 240, 310) and the legacy processor (210, 230, 320) are configured to receive an indication about a stream identifier value from the control module and to obtain a stream of transport frames for processing from the Ethernet switch by using the stream identifier value as an input stream identifier value. an Ethernet network (292, 345), configured to carry streams of transport frames according to a transport protocol; a control module (290, 330) connected to the Ethernet network (292, 345); a media relay processor (220, 240, 310), connected to the Ethernet network (292, 345) and configured to receive compressed media received from a first media relay endpoint over a network, to deliver one or more streams of packets toward a second media relay endpoint over the network, to deliver streams of transport frames to the Ethernet network (292, 345), and to receive streams of transport frames from the Ethernet network (292, 345), media payload of the compressed media received from the first media relay endpoint being embedded in the streams of transport frames; and a legacy processor (210, 230, 320), connected to the Ethernet network (292, 345), configured to receive compressed media received from a first legacy endpoint over the network, to deliver one or more streams of packets toward a second legacy endpoint over the network, to deliver streams of transport frames to the Ethernet network (292, 345), and to receive streams of transport frames from the Ethernet network (292, 345), media payload of the compressed media received from the first legacy endpoint being embedded in the streams of transport frames; wherein stream identifiers are allocated to the streams of transport frames, the allocated stream identifiers being added by the media relay processor (220, 240, 310) and the legacy processor (210, 230, 320) as part of a header of the transport frames and being used to mark the transport frames while the transport frames are traveling over the Ethernet network (292, 345), each stream identifier being associated with a multicast address for the stream; wherein the Ethernet network (292, 345) is controlled by an Ethernet switch having multicast routing capabilities; and wherein the media relay processor (220, 240, 310) and the legacy processor (210, 230, 320) are configured to receive an indication about a stream identifier value from the control module and to obtain a stream of transport frames for processing from the Ethernet switch by using the stream identifier value as an input stream identifier value.