System and method for performing ip telephony

H - Electricity – 04 – M

Patent

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Details

H04M 7/00 (2006.01) H04L 29/06 (2006.01) H04L 29/12 (2006.01)

Patent

CA 2456174

System and method for IP telephony. The system includes at least one IP telephone (IPT), a Service Gateway (SG), and a Media Gateway Controller (MGC). After the IPT is activated, the SG performs client DHCP lease negotiation with the IPT, using an identifier of the IPT to assign a range of ports to the IPT, and providing DHCP lease information, which is stored on the SG and the IPT. Operational software is downloaded from a TFTP server and executed by the IPT for initialization. The MGC registers the IPT, which then performs IP communications using one or more ports in the range of assigned ports, where the SG receives packets, performs NAPPT on source/destination IP addresses in the packet header for outgoing/incoming calls, while leaving port information unchanged, and sends the packets on to their destination, where the IPT is uniquely identified using a public IP address and port number.

La présente invention concerne un système et un procédé de téléphonie IP. Le système de l'invention comprend au moins un téléphone IP (IPT), une passerelle de service (SG), et un contrôleur de passerelle média (MGC). Après que le téléphone IPT a été activé, la passerelle SG effectue une négociation de location DHCP avec le téléphone IPT, en utilisant un identificateur de l'IPT pour attribuer une gamme de ports à l'IPT et en fournissant des informations DHCP qui sont stockées sur la passerelle SG et le téléphone IPT. Un logiciel opérationnel est téléchargé depuis un serveur TFTP et exécuté par l'IPT qui l'initialise. La passerelle MGC enregistre le téléphone IPT qui établit alors des communications IP en utilisant un ou plusieurs ports de la gamme de ports attribués, tandis que la passerelle SG reçoit les paquets, effectue une traduction NAPPT sur les adresses IP d'origine et de destination dans l'en-tête des paquets pour les appels entrants/sortants sans apporter de modifications aux informations de port, et envoie les paquets vers leur destination, l'IPT étant identifié de manière unique grâce à l'adresse IP publique et au numéro de port.

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