Abstract:
When an Internet Protocol (IP) telephony system receives a telephony communication setup request for a user of the IP telephony system, the IP telephony system attempts to setup the new telephony communication to the user's telephony device as an IP telephony communication that traverses a data network. However, if the called party wishes to instead setup the new telephony communication through an alternate telephony system, such as a cellular telephony system, the IP telephony system acts to facilitate the setup of the new telephony communication via that alternate telephony system. This could include placing a telephone call to the user's telephony device via the alternate telephony system, or receiving an incoming call from the user's telephony device that is received via the alternate telephony system.