Abstract: A method for a Circuit Switch (CS) domain user accessing an IP Multimedia Subsystem (IMS) domain includes: an access gateway control function (AGCF) entity maps CS domain signaling messages forwarded by a mobile switch center (MSC)/visiting location register (VLR) to session initiation protocol (SIP) signaling messages and transmits the SIP signaling messages to a call session control function (CSCF) entity in the IMS domain; the AGCF entity maps the SIP signaling messages transmitted from the IMS domain to the CS domain to the CS domain signaling messages and then transmits the CS domain signaling messages to the MSC/VLR. A communication system and an AGCF entity for implementing this method are also disclosed. Compared with the prior art, the present invention requires less updating and reconstruction of the existing network and is applicable for the CS domaine users of R99 version or prior to R99 version to access the IMS domain.

Abstract: The present invention relates to the communication field, disclosing a method of calling between terminals in a packet-based multimedia communication system, by which an H.323 normal-start terminal can call an H.323 terminal through an SIP relay. In the present invention, virtual SDP information is constructed and added in an SIP 200 OK message so that the SIP relay may be continued. An H.245 interaction process is divided so that information such as capabilities, an address, a port number or the like of an H. 323 terminal may be obtained. Then both parties may have the knowledge of each other through a media redirection, and a normal call can thus be established. Alternatively, the specific SDP information for carrying H.245 address information of the called H. 323 terminal is identified by specific coding/decoding information, and sent to the calling H. 323 terminal through the SIP relay. Both of the parties can establish a media communication through a negotiation.

Abstract: A refrigerator includes a Stirling refrigerating machine having a high-temperature heat radiation portion and a low-temperature heat absorption portion and for cooling a freezing compartment, and a compressor for circulating a first refrigerant through a first circulation circuit having a cooling compartment evaporator. The high-temperature heat radiation portion is in contact with a first circulation spiral portion formed in the first circulation circuit.

Abstract: A loop-type thermosiphon capable of stable operation regardless of fluctuation of heat load and a Stirling refrigerator using the same are provided. The loop-type thermosiphon transferring heat from a high-temperature heat source using a working fluid includes a evaporator having a heat absorption portion and evaporating the working fluid by depriving the high-temperature heat source of heat through the heat absorption portion, a condenser located above the high-temperature heat source and condensing the working fluid that has evaporated in the evaporator, and a pipe connecting the evaporator and the condenser so as to form a loop.

Abstract: In a Stirling cooling apparatus, a refrigerant is circulated within a refrigerant circulation circuit in such a way that the refrigerant receives cold, as latent heat, from a Stirling chiller and then releases the cold, by absorbing heat of vaporization, as it vaporizes in an evaporator, thereby cooling the inside of a refrigerator chamber. As the refrigerant, carbon dioxide, a natural refrigerant, can be suitably used.