Huawei Technologies Co., Limited

Shaoming Yang

Hanbing Chen

Embodiments of the present invention disclose a method for realizing direct dialing to an extension across Private Branch Exchanges (PBXs), in witch firstly a calling terminal of a PBX seizes a PBX circuit; secondly the calling terminal initiates a call to a called extension terminal in a PBX cluster by dialing a called extension terminal number directly; then a exchange system resolves the number of the PBX switchboard to which the calling terminal belongs according to a calling terminal number, and obtains a number of the PBX switchboard to which a called extension terminal belongs according to information of the called extension terminal number; and then the exchange system initiates a call to the PBX switchboard to which the called extension terminal belongs, and, when receiving an answer to the call from the PBX switchboard, sends the called extension terminal number, to connect the calling terminal with the called extension terminal.

Method and system for realizing direct dialing to an extension across PBXs

Embodiments of the present invention provide a security protection method and apparatus for performing security protection during service interruption occurring in a switch network. In an embodiment of the present invention, a transmitting-end device selects each sub-route from a plurality of sub-routes one by one to transmit a call to an opposite-end device; when a trunk device receives the call, it analyzes a route condition from the current selected sub-route to an opposite-end device; the trunk device determines whether to transmit the call to the opposite-end device or report a blocking message to the transmitting-end device according to the route condition; if the transmitting-end device receives the blocking message, then the transmitting-end device excludes the current selected sub-route, judges whether all the sub-routes are excluded, and determines whether to continue selecting a next sub-route or end selecting the sub-routes according to the judgment result.

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Shenzhen, China

Shaoming Yang