Network communication apparatus

• US 20060126605A1
• Filed: 11/21/2005
• Published: 06/15/2006
• Est. Priority Date: 11/25/2004
• Status: Active Grant

• Current Assignee: Ricoh Company Limited
• Original Assignee: Ricoh Company Limited
• Inventors: Kajiwara, Tomohito
• Granted Patent: US 7,701,931 B2
• Time in Patent Office: Days
• US Class Current: 370/356
• CPC Class Codes: H04L 65/103 in the network
• CPC Class Codes: H04L 65/1069 Session establishment or de-establishment
• CPC Class Codes: H04L 65/70 Media network packetisation
• CPC Class Codes: H04N 1/00214 details of transmission
• CPC Class Codes: H04N 1/0022 involving facsimile protocols or a combination of facsimile protocols and computer data transmission protocols
• CPC Class Codes: H04N 1/327 Initiating, continuing or ending a single-mode communication; Handshaking therefor H04N1/32614 takes precedence
• CPC Class Codes: H04N 1/32741 Generating ringing or calling signals or tones
• CPC Class Codes: H04N 1/32789 Details of handshaking H04N1/32793, H04N1/32795 and H04N1/32797 take precedence

Abstract

A network communication apparatus that includes a function for performing communications via an IP network and that includes an ITU-T standard T.38 communication function but does not include a voice communication function is disclosed. The network communication apparatus includes: a unit configured to generate a call connection signal including T.38 communication capability and dummy voice capability to start call connection operation; and a unit configured to perform T.38 communication operation after sending a dummy CNG packet when detecting that a second network communication apparatus at the other end does not include the T.38 communication function based on a call connection signal received from the second network communication apparatus.

Claims

1. A network communication apparatus that includes a function for performing communications via an IP network and that includes an ITU-T standard T.38 communication function but does not include a voice communication function, the network communication apparatus comprising:

a unit configured to generate a call connection signal including T.38 communication capability and dummy voice capability to start call connection operation; and

a unit configured to perform T.38 communication operation after sending a dummy CNG packet when detecting that a second network communication apparatus at the other end does not include the T.38 communication function based on a call connection signal received from the second network communication apparatus.

2. A network communication apparatus that includes a function for performing communications via an IP network and that includes an ITU-T standard T.38 communication function but does not include a voice communication function, the network communication apparatus comprising:

a unit configured to generate a call connection signal including T.38 communication capability and dummy voice capability to start call connection operation;

a unit configured to perform T.38 communication operation after sending a dummy CNG packet when detecting that a second network communication apparatus at the other end does not include the T.38 communication function and detecting that the second network communication apparatus includes the dummy voice capability based on a call connection signal received from the second network communication apparatus; and

a unit configured to perform T.38 communication operation without sending the dummy CNG packet when detecting that the second network communication apparatus does not include any one of the T.38 communication function and the dummy voice capability based on the call connection signal.

3. A network communication apparatus that includes a function for performing communications via an IP network and that includes an ITU-T standard T.38 communication function but does not include a voice communication function, the network communication apparatus comprising:

a unit configured to generate a call connection signal including T.38 communication capability and dummy voice capability to start call connection operation;

a unit configured to perform, when bandwidth limitation is not set in the network communication apparatus, T.38 communication operation after sending a dummy CNG packet when detecting that a second network communication apparatus at the other end does not include the T.38 communication function and detecting that the second network communication apparatus includes the dummy voice capability based on a call connection signal received from the second network communication apparatus, and configured to perform T.38 communication operation without sending the dummy CNG packet when detecting that the second network communication apparatus does not include any one of the T.38 communication function and the dummy voice capability; and

a unit configured to perform T.38 communication operation without sending the dummy CNG packet when the bandwidth limitation is set.

4. A network communication method performed by a network communication apparatus that includes a function for performing communications via an IP network and that includes an ITU-T standard T.38 communication function but does not include a voice communication function, the network communication method comprising the steps of:

generating a call connection signal including T.38 communication capability and dummy voice capability to start call connection operation; and

performing T.38 communication operation after sending a dummy CNG packet when detecting that a second network communication apparatus at the other end does not include the T.38 communication function based on a call connection signal received from the second network communication apparatus.

5. A network communication method performed by a network communication apparatus that includes a function for performing communications via an IP network and that includes an ITU-T standard T.38 communication function but does not include a voice communication function, the network communication method comprising the steps of:

generating a call connection signal including T.38 communication capability and dummy voice capability to start call connection operation;

performing T.38 communication operation after sending a dummy CNG packet when detecting that a second network communication apparatus at the other end does not include the T.38 communication function and detecting that the second network communication apparatus includes the dummy voice capability based on a call connection signal received from the second network communication apparatus; and

performing T.38 communication operation without sending the dummy CNG packet when detecting that the second network communication apparatus does not include any one of the T.38 communication function and the dummy voice capability based on the call connection signal.

6. A network communication method performed by a network communication apparatus that includes a function for performing communications via an IP network and that includes an ITU-T standard T.38 communication function but does not include a voice communication function, the network communication method comprising the steps of:

generating a call connection signal including T.38 communication capability and dummy voice capability to start call connection operation;

performing, when bandwidth limitation is not set in the network communication apparatus, T.38 communication operation after sending a dummy CNG packet when detecting that a second network communication apparatus at the other end does not include the T.38 communication function and detecting that the second network communication apparatus includes the dummy voice capability based on a call connection signal received from the second network communication apparatus, and performing T.38 communication operation without sending the dummy CNG packet when detecting that the second network communication apparatus does not include any one of the T.38 communication function and the dummy voice capability; and

performing T.38 communication operation without sending the dummy CNG packet when the bandwidth limitation is set.