In a split media gateway controller (MGC) and media gateway (MG) environment@ call-level application level gateways (ALG) are common in order to translate address information (i.e.@ network address and port translation (NAPT)) between two signalling domains. Typically@ the application signalling traverses the MGC. ITU-T H.248 is therefore not involved in these translations other than to set the necessary media transport parameters on applicable terminations. Increasingly bearer-level application control signalling is being used which instead traverses the MG. This bearer-level application signalling typically is used within a session that has been established by the MGC; thus@ some coordination between the two levels is needed. This Recommendation provides functionality that allows the MGC and MG to coordinate bearer-level application level gateway functionality.