Version 5.2 345 September 2007
SIP User's Manual 7. Telephony Capabilities
7.2.2.6 Fax / Modem Transparent Mode
In this mode, fax and modem signals are transferred using the current voice coder without
notifications to the user and without automatic adaptations. It's possible to use the Profiles
mechanism (refer to 'Configuring the Profile Definitions' on page 132) to apply certain
adaptations to the channel that is used for fax / modem. For example, to use the coder
G.711, to set the jitter buffer optimization factor to 13, and to enable echo cancellation for
fax and disable it for modem.
To configure fax / modem transparent mode:
IsFaxUsed = 0
FaxTransportMode = 0
V21ModemTransportType = 0
V22ModemTransportType = 0
V23ModemTransportType = 0
V32ModemTransportType = 0
V34ModemTransportType = 0
BellModemTransportType = 0
Additional configuration parameters:
• CoderName
• DJBufOptFactor
• SCE
• ECE
7.2.2.7 Fax / Modem Transparent with Events Mode
In this mode, fax and modem signals are transferred using the current voice coder with the
following automatic adaptations:
Echo Canceller = on (or off, for modems)
Echo Canceller Non-Linear Processor Mode = off
Jitter buffering optimizations
To configure fax / modem transparent with events mode, perform the following
configurations:
IsFaxUsed = 0
FaxTransportMode = 3
V21ModemTransportType = 3
V22ModemTransportType = 3
V23ModemTransportType = 3
V32ModemTransportType = 3
V34ModemTransportType = 3
BellModemTransportType = 3
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