A network element (NE) comprising a memory configured to store a digest log for a conference, a receiver coupled to the memory and configured to receive a first message from a first of a plurality of service proxies of the conference, wherein the first message comprises a signature profile of a first of a plurality of participants of the conference associated with the first service proxy, a processor coupled to the receiver and the memory and configured to track a state of the conference by updating the digest log according to the first message, and a transmitter coupled to the processor and configured to send a plurality of second messages to indicate the digest log update to the service proxies without a transmission request from the service proxies.