ISDN Terminal equipment
AssigneeRicoh Company, Ltd.
InventorsTamiko Kato, Shinichiro Ozeki, Takanori Fujii
Life of this patent
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Abstract
ISDN (Integrated Services Digital Network) terminal equipment connected to an ISDN basic rate interface and capable of enhancing efficient communication. The terminal equipment reoriginates a call as soon as an idle channel occurs. This reduces the waiting time up to call reorigination and enhances efficient communication.
Claims5
ISDN terminals connected in a multipoint configuration to an ISDN basic rate interface having two B channels for user information transfer and a single D channel for signaling and data transfer as channels which a single one of said ISDN terminals can use, said ISDN terminals being capable of holding a communication, each of said ISDN terminals comprising:
- no channel detecting means for detecting, when one of said ISDN terminals is using said two B channels, a signal indicative of a no idle channel condition which is sent to another of said ISDN terminals and indicates to said another of said ISDN terminals that both of said B channels are being used;
- and
- channel releasing means for releasing by said one of said ISDN terminals, when said no channel detecting means detects said signal, one of said two B channels having been used by said one of said ISDN terminals.
ISDN terminal equipment connected in a multipoint configuration to an ISDN basic rate interface having two B channels for user information transfer and a single D channel for signaling and data transfer as channels which a single terminal equipment can use, said ISDN terminal equipment being capable of holding a communication, said ISDN terminal equipment comprising:
- SETUP detecting means for detecting, when said ISDN terminal equipment is using said two B channels, a message SETUP terminated at said ISDN terminal equipment from said ISDN;
- and
- channel releasing means for releasing, when said SETUP detecting means detects said message SETUP, one of said two B channels having been used by said ISDN terminal equipment.
Dependencies are inferred from the claim text.