Facsimile and static presentation processing – Facsimile – Facsimile relay system
Reexamination Certificate
2005-02-14
2009-12-29
Safaipour, Houshang (Department: 2625)
Facsimile and static presentation processing
Facsimile
Facsimile relay system
C358S442000, C358S434000, C379S100170, C379S093310, C370S352000, C370S389000
Reexamination Certificate
active
07639403
ABSTRACT:
An improved method and system for connecting Super Group 3 fax machines over network gateways that operate using the un-enhanced T.38 protocol. With the present invention, the CM tone is suppressed. Thus a gateway that generates an AnsAm tone, will not receive a CM tone in response. The T.38 protocol does not specify what occurs if a CM tone is not received; however, it has been found that, in practice, existing fax machines fall back to V.21 mode if a CM tone is not received.
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Garakani Mehryar Khalili
Luong Hanh
Read Brooks S.
Umansky Ilya
White Steven J.
Cisco Technology Inc.
Marger & Johnson & McCollom, P.C.
Safaipour Houshang
Worku Negussie
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