Solving the firewall and NAT traversal issues for SIP-based VoIP

Voice over the Internet Protocol (VoIP) - telephony over the Internet - is gaining popularity. VoIP is an evolving technology that still has several problems. Some of them are caused by network topology, such as the deployment of firewalls and network address translation (NAT). This is referred to as the ldquoNAT and firewall problemrdquo. This paper… CONTINUE READING