Patent ID: 7623273
Filing Date: 2009-11-24
Classification: H04N

Abstract:
1. A method of connecting a first V.34 enabled fax machine to a second V.34 enabled fax machine over a network utilizing at least one gateway that operates in accordance with the T.38 un-enhanced protocol, said fax machines having an initial handshaking process during which an AnsAm signal consisting of a 2100 Hz tone with a 15 Hz envelope is generated, said method including: placing a call by said first fax machine to said second fax machine over a voice grade connection, generating an AnsAm signal by said second fax machine in response to said call, modifying the AnsAm signal generated during the initial handshaking by removing the 15 Hz envelope, whereby the first fax machine does not generate a CM tone, and said second fax machine falls back to G3 mode, and said first and second fax machine communicate using the G3 protocol.