AudioCodes MP-1FXO Manuel d'utilisateur télécharger pdf (Page 221)

SIP User's Manual 8. Telephony Capabilities

Version 5.0 221 December 2006

8.3.4 Supporting V.34 Faxes

V.34 faxes don’t comply with the T.38 relay standard. We therefore provide the optional

modes described under Sections 8.3.4.1 and 8.3.4.2:

Note that the CNG detector is disabled (CNGDetectorMode=0) in all the following

examples.

8.3.4.1 Using Bypass Mechanism for V.34 Fax Transmission

In this proprietary scenario, the media gateway uses a high bit-rate coder to transmit V.34

faxes, enabling the full utilization of its speed.

Refer to the following configurations:

FaxTransportMode = 2 (Bypass)

V34ModemTransportType = 2 (Modem bypass)

V32ModemTransportType = 2

V23ModemTransportType = 2

V22ModemTransportType = 2

In this configuration, both T.30 and V.34 faxes work in Bypass mode.

FaxTransportMode = 1 (Relay)

V34ModemTransportType = 2 (Modem bypass)

V32ModemTransportType = 2

V23ModemTransportType = 2

V22ModemTransportType = 2

In this configuration, T.30 fax uses T.38 Relay mode while V.34 fax uses Bypass mode.

8.3.4.2 Using Relay mode for both T.30 and V.34 faxes

In this scenario, V.34 fax machines are compelled to use their backward compatibility with

T.30 faxes; as a T.30 machine, the V.34 fax can use T.38 Relay mode.

Refer to the following configuration:

FaxTransportMode = 1 (Relay)

V34ModemTransportType = 0 (Transparent)

V32ModemTransportType = 0

V23ModemTransportType = 0

V22ModemTransportType = 0

Both T.30 and V.34 faxes use T.38 Relay mode. This configuration forces the V.34 fax

machine to operate in the slower T.30 mode.

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AudioCodes MP-1FXO Manuel d'utilisateur Page 221