Abstract: A communication terminal unit has a system control section including a communication error detection section that detects a communication error, which occurs at the time of originating a call over an IP network or a public network. A communication error analysis section analyzes the thus-detected communication error, and in accordance with the result of analysis of the communication error, a call origination network determination section automatically determines whether to re-dial a call over the IP network or the public network. As a result, when detecting a communication error at the time of origination of a call over the IP network or the public network, a system control section performs control operation for analyzing the communication error and automatically determining whether to re-dial a call over the IP network or over the public network.

Abstract: A communication terminal unit has a system control section including a call destination specification information analysis section that analyzes a destination number which is assigned to a communications terminal unit at the other end and input at the time of origination of a call. On the basis of a result of analysis of the destination number performed by the call destination specification information analysis section, a call origination network determination section automatically determines to originate a call over an IP network or over a public network through use of the destination information that has been subjected to analysis and through use of selected network setting information stored in a selected network setting storage section. Selected network setting information required to automatically determine to originate a call over the IP network or over the public network is stored in the call origination network determination section.

Abstract: A received document sorting control method for an image processing device that has a facsimile communication unit for communications via Internet, and receives documents by means of the facsimile communication unit, comprising: previously setting prescribed condition information for judging whether or not a received document is subject to automatic sorting, and for judging a prescribed sorting method in a case that automatic sorting is to be implemented; and checking contents of transmission identification information transmitted by a sender on the basis of the prescribed condition information, and controlling automatic sorting processing for a document received in a communication, in accordance with the corresponding prescribed sorting method, if the document received in the communication is judged to be subject to the automatic sorting.

Abstract: A communication terminal device which comprises an SIP call control unit that performs call control by using an SIP (Session Initiation Protocol), a recognition unit that recognizes that a calling has become an error according to a response signal sent back from a called party terminal after making the call according to the SIP call control procedure, a redial management unit that manages a redial interval to make a redial when the calling has become an error, and a redial control unit that performs redial control according to redial information when the calling has become an error and the response signal contains the redial information.

Abstract: A virtual voice mode facsimile communication unit, comprised of a TCP/UDP/IP control section which controls an IP protocol and a TCP/UDP protocol, a real-time transfer control section which controls a real-time transfer protocol, a voice encoding/decoding section which encodes/decodes a voice signal, a MODEM which modulates/demodulates assuming that a facsimile signal is a voice signal, a T30 control section which controls a T.30 facsimile protocol and a communication image processing section which conducts image processing of communication image data, is provide for real-time facsimile communications with a conventional facsimile apparatus over an IP network in a state kept connected to a LAN via a network I/F.

Abstract: A communication terminal unit has a system control section including a call destination specification information analysis section that analyzes a destination number which is assigned to a communications terminal unit at the other end and input at the time of origination of a call. On the basis of a result of analysis of the destination number performed by the call destination specification information analysis section, a call origination network determination section automatically determines to originate a call over an IP network or over a public network through use of the destination information that has been subjected to analysis and through use of selected network setting information stored in a selected network setting storage section. Selected network setting information required to automatically determine to originate a call over the IP network or over the public network is stored in the call origination network determination section.

Abstract: A communication terminal unit has a system control section including a communication error detection section that detects a communication error, which occurs at the time of originating a call over an IP network or a public network. A communication error analysis section analyzes the thus-detected communication error, and in accordance with the result of analysis of the communication error, a call origination network determination section automatically determines whether to re-dial a call over the IP network or the public network. As a result, when detecting a communication error at the time of origination of a call over the IP network or the public network, a system control section performs control operation for analyzing the communication error and automatically determining whether to re-dial a call over the IP network or over the public network.

Abstract: A communication terminal device which comprises an SIP call control unit that performs call control by using an SIP (Session Initiation Protocol), a recognition unit that recognizes that a calling has become an error according to a response signal sent back from a called party terminal after making the call according to the SIP call control procedure, a redial management unit that manages a redial interval to make a redial when the calling has become an error, and a redial control unit that performs redial control according to redial information when the calling has become an error and the response signal contains the redial information.

Abstract: A received document sorting control method for an image processing device that has a facsimile communication unit for communications via Internet, and receives documents by means of the facsimile communication unit, comprising: previously setting prescribed condition information for judging whether or not a received document is subject to automatic sorting, and for judging a prescribed sorting method in a case that automatic sorting is to be implemented; and checking contents of transmission identification information transmitted by a sender on the basis of the prescribed condition information, and controlling automatic sorting processing for a document received in a communication, in accordance with the corresponding prescribed sorting method, if the document received in the communication is judged to be subject to the automatic sorting.