Firewall-Friendly VoIP Secure Gateway and VoIP Security Issues

IP telephony services using VoIP (Voice over Internet Protocol) technologies have rapidly spread over the last several years. However, interoperation of an IP-PBX (Private Branch eXchange) service and a consumer IP telephony service has not yet been achieved. This is because typical intranets are protected by firewalls and IP telephony protocols are not firewall-friendly because, among other reasons, they use UDP (User Datagram Protocol)-based protocols. In this paper, we explain the technologies of the VoIP Secure Gateway, which makes IP telephony protocols firewall-friendly and enables an enterprise IP-PBX service to interoperate with a consumer IP telephony service through a firewall. Also, we look at other security problems that need to be solved in order to expand IP telephony services in the future.

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