User's Manual
170
Document #: LTRT-10375
Mediant 500 MSBR
17.2.2.2 G.711 Fax / Modem Transport Mode
In this mode, when the terminating device detects fax or modem signals (CED or AnsAM),
it sends a Re-INVITE message to the originating device, requesting it to re-open the
channel in G.711 VBD with the following adaptations:
Echo Canceller = off
Silence Compression = off
Echo Canceller Non-Linear Processor Mode = off
Dynamic Jitter Buffer Minimum Delay = 40
Dynamic Jitter Buffer Optimization Factor = 13
After a few seconds upon detection of fax V.21 preamble or super G3 fax signals, the
device sends a second Re-INVITE enabling the echo canceller (the echo canceller is
disabled only on modem transmission).
A ‘gpmd’ attribute is added to the SDP according to the following format:
For G.711 A-law:
a=gpmd:0 vbd=yes;ecan=on (or off for modems)
For G.711 µ-law:
a=gpmd:8 vbd=yes;ecan=on (or off for modems)
The following parameters are ignored and automatically set to
Events Only
:
'Fax Transport Mode' (FaxTransportMode)
'Vxx ModemTransportType' (VxxModemTransportType)
To configure fax / modem transparent mode:
1.
Open the Gateway General Settings page (
Setup
menu >
Signaling & Media
tab >
Gateway
folder >
Gateway General Settings
), and then from the 'Fax Signaling
Method' drop-down list (IsFaxUsed), select
G.711 Transport
:
Figure
17-5: Configuring Fax Signaling to G.711
2.
Click
Apply
.
17.2.2.3 Fax Fallback
In this mode, when the terminating device detects a fax signal, it sends a Re-INVITE
message to the originating device with T.38. If the remote device doesn’t support T.38
(replies with SIP response 415 "Media Not Supported"), the device sends a new Re-
INVITE with G.711 VBD with the following adaptations:
Echo Canceller = on
Silence Compression = off
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
Summary of Contents for Mediant 500 MSBR
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Page 115: ...Part III General System Settings ...
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Page 137: ...Part IV General VoIP Configuration ...
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Page 455: ...Part V Gateway Application ...
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Page 751: ...Part VIII Data Router Configuration ...
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Page 757: ...Part IX Maintenance ...
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Page 837: ...Part X Status Performance Monitoring and Reporting ...
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Page 927: ...Part XI Diagnostics ...
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