The invention includes a method and apparatus for signaling proprietary information between network elements of a core network (CN) of a wireless communication network. A method for signaling proprietary information within the CN includes encoding the proprietary information in an IPv4 Options field of an inner header of an IP packet, and pre-pending an outer header to the IP packet for Mobile IPv4 (MIPv4) tunneling the IP packet from a first node of the CN to a second node of the CN. The first and second nodes of the CN may include a mobility anchor node and a mobility gateway node, respectively. The first and second nodes of the CN may include a mobility gateway node and a mobility anchor node, respectively. A method for signaling proprietary information includes receiving a tunneled IP packet at a first node of the CN (where the IP packet includes an outer header, an inner header, and a payload), removing the outer header from the IP packet, stripping an IP Options field from the inner header of the IP packet where the IPv4 Options field includes the proprietary information, and propagating the proprietary information from the first node of the CN to a second node. The first node of the CN may be a mobility gateway node and the second node may be a node of a radio access network (RAN). The first node of the CN may be a mobility anchor node and the second node may be another node of the CN.