31results about How to "Implement voice calls" patented technology

The invention discloses a modem used for realizing that a software telephone uses a communication line of an entity IP (Internal Protocol) telephone to establish talking. The modem comprises a communication module, a judgment module, a recording module and a modification module, wherein the communication module is used for receiving a talking request packet from the software telephone, and also transmitting the modified talking request packet to a server and receiving a talking response packet from the server; the judgment module is used for judging whether the talking request packet containsa special mark or not and whether the entity IP telephone is in an idle state or not; the recording module is used for recording a source IP address of the talking request packet when the entity IP telephone is in the idle state; the modification module is used for modifying the source IP address of the talking request packet to be an IP address of the entity IP telephone. The modification modulemodifies a target IP address of the talking response packet to be a source IP address recorded in the recording module, and the communication module resends the modified talking response packet to the software telephone so as to establish the talking.

The invention discloses a mine safety production monitoring system. By the system, staff on the ground can monitor the safety production condition of running of an underground coal face and a belt conveyor in real time. The system comprises a ground main system, data exchange equipment, an underground work face control system and an underground belt conveyor protection system; the underground work face control system and the underground belt conveyor protection system are connected with the ground main system through the data exchange equipment; and the underground work face control system and the underground belt conveyor protection system control, protect, and monitor all equipment such as the underground coal face, a diving work face, an underground belt conveyor and the like, and can perform information acquisition on all the equipment such as the underground coal face, the diving work face, the underground belt conveyor and the like. By the system, the control, protection, line communication, fault detection, display, alarm and other functions of all equipment such as the underground coal face, the diving work face, the belt conveyor and the like are realized, ground and underground information sharing, and voice communication are realized, and ground equipment can perform remote monitoring on underground equipment; and the system is the most advanced communication control system in the field of coal mine at present.

The invention discloses a device for receiving a call from a different network number based on a single-card dual-standby secondary number, which includes a mobile phone terminal A and a mobile phone terminal B, and also includes a different-network switching center in the same network as the mobile phone terminal A. Among them, the different network switching center is connected to the gateway office responsible for the interconnection of other networks or operators. The gateway office is also connected to the provincial HLR and the local MSC. The local MSC is also connected to the MGW and the single-card dual-standby voice center in turn. The mobile terminal A and the mobile terminal B of the mobile phone are respectively connected to the inter-network switching center and the local MSC through the network. The invention can realize that a secondary number of a mobile terminal used as a living number can receive calls from numbers in different networks.