Version 5.8 499 October 2009
SIP User's Manual 9. IP Telephony Capabilities
V23ModemTransportType = 2
V22ModemTransportType = 2
Configure the following parameters to use bypass mode for V.34 faxes and T.38 for T.30
faxes:
FaxTransportMode = 1 (Relay)
V34ModemTransportType = 2 (Modem bypass)
V32ModemTransportType = 2
V23ModemTransportType = 2
V22ModemTransportType = 2
9.6.3.2 Using Relay mode for both 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.
Use the following parameters to use T.38 mode for both V.34 faxes and T.30 faxes:
FaxTransportMode = 1 (Relay)
V34ModemTransportType = 0 (Transparent)
V32ModemTransportType = 0
V23ModemTransportType = 0
V22ModemTransportType = 0
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