Technique for connecting fax machines with advanced...

Facsimile and static presentation processing – Facsimile – Facsimile relay system

Reexamination Certificate

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Details

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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