US 6,324,187 B1 · Communication apparatus

Abstract

An object of the invention is to provide a communication apparatus capable of communicating by transmitting and receiving a protocol signal in accordance with a predetermined protocol, when receiving a DIS without receiving an ANSam signal, or not receiving a CM signal within a predetermined period after transmission of the ANSam signal. With a line connection established, when a calling station receives a DIS without receiving the ANSam signal, the calling station sends a DCS signal or an NSS and then executes the protocol according to Recommendation T.30. Further, with a line connection established, when a called station does not receive the CM signal within a predetermined time t1 after transmission of the ANSam signal, the called station sends the DIS with bit number 6 reset, and executes the protocol according to Recommendations T.30 in response to the DCS signal or NSS sent from the destination communication apparatus. Furthermore, the protocol according to Recommendations V.8 and V.34 are executed in response to the CM signal or a CI signal in placed of the DCS signal or the NSS.

Claims4

Dependent claims

A communication apparatus capable of communicating with a destination communication apparatus according to protocols of Recommendations T.30, V.8 and V.34 of the ITU-T comprising:

transmitting/receiving means for transmitting and receiving a communication signal;
signal detecting means for detecting whether a digital identification signal (DIS) is received from the destination communication apparatus after a line connection thereto is established with the destination communication apparatus serving as a calling station;
and
control means for, when reception of the DIS is detected by the signal detecting means, allowing a digital command signal (DCS) or a nonstandard facilities set-up signal (NSS) to be sent regardless of whether bit number 6 indicative of presence or absence of an capability of the Recommendation V.8 is 0 or 1, and then a protocol signal according to Recommendation T.30 to be sent.

1 more element

Dependencies are inferred from the claim text.

Communication apparatus

Life of this patent

Communication apparatus

Life of this patent

Abstract

Claims4