Mechanism for implementing voice over IP telephony behind network firewalls
First Claim
Patent Images
1. A network comprising:
- a network firewall; and
two or more stations implementing Voice Over Internet Protocol (VOIP), coupled to the firewall, each station including;
a port assignment module to assign a dedicated port to the station using a pre-assigned base port value; and
a heartbeat generator to transmit dummy packets to the dedicated port at predetermined intervals to keep open the dedicated port to enable call signaling from devices external to the firewall.
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Abstract
According to one embodiment, a network is disclosed. The network includes a first Voice Over Internet Protocol (VOIP) station a first communication medium coupled to the VOIP station a router, coupled to the first communication, that includes a network address translation (NAT) firewall, a second communication medium coupled to the router and a public proxy/gatekeeper (PPG) coupled to the second communication. The PPG masquerades un-translated NAT IP addresses received from the first VOIP station.
29 Citations
12 Claims
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1. A network comprising:
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a network firewall; and two or more stations implementing Voice Over Internet Protocol (VOIP), coupled to the firewall, each station including; a port assignment module to assign a dedicated port to the station using a pre-assigned base port value; and a heartbeat generator to transmit dummy packets to the dedicated port at predetermined intervals to keep open the dedicated port to enable call signaling from devices external to the firewall. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A Voice Over Internet Protocol (VOIP) station comprising:
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a port assignment module to assign a dedicated port to the station using a pre-assigned base port value; and a heartbeat generator to transmit dummy packets to the dedicated port at predetermined intervals to keep open the dedicated port to enable call signaling from devices external to the firewall. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification