An apparatus and method are described that provide signaling mediation between different protocols, or different implementations of the same protocol, at network boundaries for voice over Internet Protocol telephony. The signaling mediation device translates control messages from one protocol, or implementation of a protocol, into another protocol, or implementation of a protocol based on the type of networks to which the signaling mediation device is connected. The signaling mediation device also includes profiles for the networks to which it is connected based on the type of equipment in those networks. The profiles provide additional mapping and translation based on implementation specific characteristics of the network equipment connected to the signaling mediation device.