Patent ID: 8649498

Claim:
A method for managing in-bound voice traffic in an IP telephony network in an enterprise, the method comprising: receiving, at a routing engine, an incoming call from a gateway in communication with a public switched telephone network (PSTN), wherein the received incoming call comprises a calling number, a called number, and a caller identification; accessing a mapping of called numbers to individual user labels for uniquely identifying destination telephony users in the IP telephony network from a database maintained at the routing engine, the user labels comprising: a call prefix for identifying unique destination routing engines within the IP telephony network, a routing identification, distinct from the call prefix, for identifying sites hosted by each destination routing engine, and an extension identification, distinct from the call prefix and the routing identification, for identifying destination telephony users at each site; based on the mapping, translating the called number to a particular user label for identifying a destination telephony device in the IP telephony network; determining that the call prefix of the particular user label matches a call prefix assigned to the routing engine; and identifying a site hosted by the routing engine and having an assigned routing identification matching a routing identification of the particular user label; and transferring the incoming call from the routing engine to the site hosted by the routing engine and having the same routing identification as the routing identification of the particular user label, wherein the user label comprises a form of AA.XXX.EC.YYYY.