Fax / Modem Transparent Mode - AudioCodes MediaPack MP-124 User Manual

SIP User's Manual
Echo Canceller Non-Linear Processor Mode = off
Dynamic Jitter Buffer Minimum Delay = 40
Dynamic Jitter Buffer Optimization Factor = 13
When the device initiates a fax session using G.711, a 'gpmd' attribute is added to the SDP
according to the following format:
For G.711A-law: a=gpmd:0 vbd=yes;ecan=on
For G.711 µ-law: a=gpmd:8 vbd=yes;ecan=on
In this mode, the parameter FaxTransportMode is ignored and automatically set to
'transparent'.
To configure fax fallback mode, set IsFaxUsed to 3.
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 165) 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
V22ModemTransportType = 0
V23ModemTransportType = 0
V32ModemTransportType = 0
V34ModemTransportType = 0
BellModemTransportType = 0
Additional configuration parameters:
•
CoderName
•
DJBufOptFactor
•
EnableSilenceCompression
•
EnableEchoCanceller
Note:
Version 5.4
This mode can be used for fax, but is not recommended for modem
transmission. Instead, use the modes Bypass (refer to ''Fax/Modem Bypass
Mode'' on page 316) or Transparent with Events (refer to ''Fax / Modem
Transparent with Events Mode'' on page 320) for modem.
319
7. IP Telephony Capabilities
May 2008