The disclosure relates to wireless communications. An aspect generates a plurality of packets of data, each packet comprising a header and a payload of media data, receives opaque data related to a payload of at least one packet, and embeds the opaque data in an extension header of the at least one packet. An aspect receives a plurality of packets of data, each packet comprising a header and a payload of media data, and receives opaque data related to a payload of at least one packet, the opaque data embedded in an extension header of the at least one packet.