SIP User's Manual 252 Document #: LTRT-65415
MediaPack Series
The parameters defining payload type for the proprietary AudioCodes’ Bypass mode
FaxBypassPayloadType and ModemBypassPayloadType are not used with NSE Bypass.
When configured for NSE mode, the device includes in its SDP the following line:
a=rtpmap:100 X-NSE/8000
(where 100 is the NSE payload type)
The Cisco gateway must include the following definition: "modem passthrough nse
payload-type 100 codec g711alaw".
To configure NSE mode, perform the following configurations:
IsFaxUsed = 0
FaxTransportMode = 2
NSEMode = 1
NSEPayloadType = 100
V21ModemTransportType = 2
V22ModemTransportType = 2
V23ModemTransportType = 2
V32ModemTransportType = 2
V34ModemTransportType = 2
BellModemTransportType = 2
8.2.6.2.6 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
8.2.6.2.7 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 (see ''Coders and Profile Definitions'' on page 117) to
apply certain adaptations
to the channel used for fax / modem (e.g., 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, use the following parameters:
IsFaxUsed = 0
FaxTransportMode = 0
V21ModemTransportType = 0
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