User's Manual 206 Document #: LTRT-89730
Mediant 3000
e. Set the 'V.34 Modem Transport Type' parameter to Enable Bypass
(V34ModemTransportType = 2).
2. Set the ini file parameter, V34FaxTransportType to 2 (Bypass).
15.2.3.2 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.
To use T.38 mode for V.34 and T.30 faxes:
1. In the Fax/Modem/CID Settings page, do the following:
a. Set the 'Fax Transport Mode' parameter to T.38 Relay (FaxTransportMode = 1).
b. Set the 'V.22 Modem Transport Type' parameter to Disable
(V22ModemTransportType = 0).
c. Set the 'V.23 Modem Transport Type' parameter to Disable
(V23ModemTransportType = 0).
d. Set the 'V.32 Modem Transport Type' parameter to Disable
(V32ModemTransportType = 0).
e. Set the 'V.34 Modem Transport Type' parameter to Disable
(V34ModemTransportType = 0).
2. Set the ini file parameter, V34FaxTransportType to 1 (Relay).
To allow V.34 fax relay over T.38:
In the Advanced Parameters page (Configuration tab > VoIP menu > SIP Definitions >
Advanced Parameters), set the 'SIP T.38 Version' parameter to Version 3
(SIPT38Version = 3).
To force V.34 fax machines to use their backward compatibility with T.30 faxes
and operate in the slower T.30 mode:
Set the 'SIP T.38 Version' parameter to Version 0 (SIPT38Version = 0).
Note: Transcoding of T.38 Version 3 is supported only for Gateway calls. For SBC
calls, the device forwards T.38 Version 3 transparently (as is) to the other leg (i.e., no
transcoding).
15.2.3.3 V.34 Fax Relay for SG3 Fax Machines
Super Group 3 (SG3) is a standard for fax machines that support speeds of up to 33.6
kbps through V.34 half duplex (HD) modulation. The following procedure describes how to
configure V.34 (SG3) fax relay support based on ITU Specification T.38 version 3.
To enable support for V.34 fax relay (T.38) at SG3 speed:
1. In the IP Profile table (Configuration tab > VoIP menu > Coders and Profiles > IP
Profile Settings), configure an IP Profile with the 'Fax Signaling Method' parameter
(IpProfile_IsFaxUsed) set to T.38 Relay.
2. In the General Settings page (Configuration tab > VoIP menu > Media > General
Media Settings), set the 'DSP Version Template Number' parameter
(DSPVersionTemplateNumber) to "10" to support up to 1,512 channels. Reset the
device for the settings to take effect.
3. In the Coders Table (Configuration tab > VoIP menu > Coders and Profiles >
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