Image communication control method, image communication control program, and image communication apparatus
First Claim
1. An image communication control method for conducting image communication by using one of a plurality of different image communication systems via sending/receiving paths including an IP network,wherein a transmitter and receivers for conducting the image communication or devices for relaying the image communication existing in the sending/receiving paths include SDP media stream descriptions in an SIP message and send it on the basis of an SIP protocol, the SDP media stream descriptions comprising different image communication systems usable by the transmitter and the receivers for conducting the image communication and image communication control parameters described based on given syntaxes;
- wherein the transmitter and the receivers for conducting the image communication select an image communication system for use in practical image communication and image communication control parameters to be used in the appropriate image communication system in given order of priority on the basis of the SDP media stream descriptions in the SIP message received from an apparatus in the opponent party and control the image communication and output processing in the image receiving party by using the selected image communication system and image communication control parameters,wherein when the image communication control parameters of the SDP media stream descriptions are parameters indicating that image data is sent or received in the considered-speech ITU-T Recommendation T.30 facsimile communication system, they include information specifying a speech encoding method suitable for digital/analog conversion of a speech signal, andwherein the image communication system for use in the image communication and the image communication control parameters to be used in the appropriate image communication system are selected in order of priority based on order of appearance in the SDP media stream descriptions in the SIP message.
1 Assignment
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Accused Products
Abstract
When image communication is conducted by using one of a plurality of different image communication systems via a sending/receiving path including an IP network (101), a transmitter (105) and receivers (108, 108a, 112, 115) or devices (gateway (111, 113) or an IP network interface (109)) for relaying the image communication existing in the sending/receiving path store SDP media stream descriptions, which include different image communication systems usable by the transmitter and receivers, in an SIP message and send the SIP message, and select an image communication system for use in practical image communication in given order of priority and image communication control parameters to be used in the appropriate image communication system, on the basis of the SDP media stream descriptions. Whereby, an appropriate image communication system can be automatically selected from various image communication system that can be used between a calling terminal and a called terminal, without a need for a complicated operating procedure or setup procedure.
39 Citations
8 Claims
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1. An image communication control method for conducting image communication by using one of a plurality of different image communication systems via sending/receiving paths including an IP network,
wherein a transmitter and receivers for conducting the image communication or devices for relaying the image communication existing in the sending/receiving paths include SDP media stream descriptions in an SIP message and send it on the basis of an SIP protocol, the SDP media stream descriptions comprising different image communication systems usable by the transmitter and the receivers for conducting the image communication and image communication control parameters described based on given syntaxes; -
wherein the transmitter and the receivers for conducting the image communication select an image communication system for use in practical image communication and image communication control parameters to be used in the appropriate image communication system in given order of priority on the basis of the SDP media stream descriptions in the SIP message received from an apparatus in the opponent party and control the image communication and output processing in the image receiving party by using the selected image communication system and image communication control parameters, wherein when the image communication control parameters of the SDP media stream descriptions are parameters indicating that image data is sent or received in the considered-speech ITU-T Recommendation T.30 facsimile communication system, they include information specifying a speech encoding method suitable for digital/analog conversion of a speech signal, and wherein the image communication system for use in the image communication and the image communication control parameters to be used in the appropriate image communication system are selected in order of priority based on order of appearance in the SDP media stream descriptions in the SIP message. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification