Patent ID: 8296837
Filing Date: 2012-10-23
Classification: H04L,H04M

Abstract:
1. A system comprising: an external firewall connected to an external communication network and a DMZ; an internal firewall connected to an internal communication network and the DMZ; an IP-PBX connected to the internal communication network; and a VoIP proxy server connected directly to the DMZ, the VoIP proxy server configured to receive a request from an ePhone connected to the external communication network for a trivial file transfer protocol (TFTP) service, identify a source IP address of the ePhone in the request, push a firewall policy change to the external firewall after receiving the request from the ePhone, forward a call control message to the IP-PBX via the internal firewall, receive a registration request for the ePhone in response to the call control message from the IP-PBX, and forward the registration request to the ePhone through the external firewall, the external firewall configured to open a port for the source IP address and only allow packets having a source IP address identical to the source IP address of the ePhone through the external firewall at that port in response to the firewall policy change.