Relay Mode for T.30 and V.34 Faxes

In this scenario, V.34 fax machines are forced to use their backward compatibility with T.30 faxes and operate in the slower T.30 mode.

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To use T.38 mode for V.34 and T.30 faxes:

1.

On the Fax/Modem/CID Settings page, do the following:

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Set the 'Fax Transport Mode' parameter to T.38 Relay (FaxTransportMode = 1).

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Set the 'V.22 Modem Transport Type' parameter to Disable (V22ModemTransportType = 0).

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Set the 'V.23 Modem Transport Type' parameter to Disable (V23ModemTransportType = 0).

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Set the 'V.32 Modem Transport Type' parameter to Disable (V32ModemTransportType = 0).

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Set the 'V.34 Modem Transport Type' parameter to Disable (V34ModemTransportType = 0).

2.

Configure the [V34FaxTransportType] parameter to [1] (Relay).

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To allow V.34 fax relay over T.38:

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Set the 'SIP T.38 Version' parameter to Version 3 (SIPT38Version = 3).

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To force V.34 fax machines to use their backward compatibility with T.30 faxes and operate in the slower T.30 mode:

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Set the 'SIP T.38 Version' parameter to Version 0 (SIPT38Version = 0).