It will depend on what the requirements for the code will actually be it's Lawful Intercept btw, there are TCF working parties working with the appropiate agencys now, then it will depend what companies are required to do , some may have already looked at it and already deployed technolgy to take this into account in a Next Gen world, others not, there will also be voice and data requirements and these are very different. Depending on the deployed technology and the vendors will dictate the costs of this, it will be varied depending on Vendor and requirements... it also won't be cheap