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 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 T38 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 T38 Version' parameter to Version 0 (SIPT38Version = 0).
16.2.3.3 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. This procedure below 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 Coders Table (Configuration tab > VoIP menu > Coders and Profiles >
Coders), set the coder used by the device to G.729 (or any other supported codec).
3. On the Fax/Modem/CID Settings page, do the following:
a. Set the 'SIP T38 Version' parameter to Version 3 (SIPT38Version = 3).
b. Set the 'Fax Relay Max Rate' parameter (RelayMaxRate) to 33,600bps (default).
c. Set the 'CNG Detector Mode' parameter (CNGDetectorMode) to Disable
(default).
d. Set the 'V.21 Modem Transport Type' parameter to Disable
(V21ModemTransportType = 0).
e. Set the 'V.22 Modem Transport Type' parameter to Disable
(V22ModemTransportType = 0).
f. Set the 'V.23 Modem Transport Type' parameter to Disable
(V23ModemTransportType = 0).
g. Set the 'V.32 Modem Transport Type' parameter to Disable
(V32ModemTransportType = 0).
h. Set the 'V.34 Modem Transport Type' parameter to Disable
(V34ModemTransportType = 0).
4. Set the ini file parameter, V34FaxTransportType to 1 (i.e., relay).
5. Set the ini file parameter, T38MaxDatagramSize to 560 (default).
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