Patent ID: 7035248

Claim:
A communication network adhering to a session initiation protocol (SIP) for establishing telephonic communication between devices, the network comprising: a SIP-unobservant device; a SIP-observant device; a switching device connected to said SIP-unobservant device, said switching device including an emulation client operative between the SIP-unobservant device and the SIP-observant device, said emulation client characterized in that a call establishment message transmitted by the SIP-unobservant device in a SIP-unobservant format is converted to a SIP-observant format by the emulation client and transmitted to the SIP-observant device; and a location server connected to said switching device, said location server including redirection information for redirecting calls, wherein said location server including a location database for storing the redirection information, the communication network further characterized in that the emulation client retrieves from the location database redirection information containing rules and algorithms associated with the call establishment message and redirects the call establishment message based on the retrieved redirection information.