SYSTEM AND METHOD FOR DYNAMICALLY CREATING PINHOLES IN A FIREWALL OF A SIP-BASED

摘要

A communications system (10) and method for dynamically creating at least one pinhole in a firewall (22a, 22b) are provided. The communications system includes a protected node (12a, 12b)capable of initiating a communication session with an outside node. In this regard, the protected node (12a, 12b) is capable of receiving flow parameters regarding the communication session as the communication session is setup. The system also includes a firewall (22a, 22b) disposed along a communications path between the protected node and the outside node. The protected node is capable of sending at least a portion of the flow parameters to a firewall-controlled proxy (24a, 24b), which in turn, is capable of forwarding the portion of the flow parameters to the firewall. Thereafter, the firewall is capableof creating at least one pinhole based upon the portion of the flow parameters to thereby permit the transmission of information between the outside node and the protected node during the communication session.