sentences:  Infrastructure issues make it less practical and useful to implement than the more recent GAN/UMA system, which can make use of usually unmetered and neutral Internet service to provide the connection back to the network operator.Like the later GAN/UMA standard, GIP makes use of a technology that doesn't require licensed spectrum to expand capacity and allow end users, in theory, to improve coverage in areas difficult to reach via large, external, cell towers.GIP is a DECT "profile", meaning a set of protocols that runs over the base DECT system.