Patent ID: 8428582

Claim:
A system for roaming in a telephony data network, the system comprising: a home telephony adapter for automatically transferring, without providing first authentication information, user profile data associated with the home telephony adapter to a non-transitory computer readable medium, wherein the user profile data comprises a telephone number associated with the home telephony adapter, settings related to features that can be applied to a call including caller identification settings, call waiting settings, three-way calling settings, and call forwarding settings, and settings related to a telephone associated with the home telephony adapter including ring tone selection settings, display settings, and telephone book information; a visiting telephony adapter: for receiving second authentication information; for receiving, based on the second authentication information, the user profile data from the non-transitory computer readable medium; for transmitting a registration message to a call control element, the registration message comprising a request to associate the telephone number associated with the home telephony adapter with an internet protocol address associated with the visiting telephony adapter; and for receiving a forwarded telephone call wherein the forwarded telephone call was destined for the telephone number associated with the home telephony adapter, and the call control element: for authenticating the registration message; and for associating the telephone number associated with the home telephony adapter with the internet protocol address associated with the visiting telephony adapter.