Version 6.6
691
October 2014
Installation & Operation Manual
41. PSTN Gateway and IP-to-IP Applications
Parameter
Name
Type
Provisioning
Type
Description
Is Fax Used. Enum
NoFax, T38, G711, FallBack
Instant
Determines the SIP signaling
method used to establish and
convey a fax session after a fax
is detected.
NoFax = No fax negotiation
using SIP signaling (default).
T38 = Initiates T.38 fax relay.
G711 = Initiates fax using the
coder G.711 A-law/m-law with
adaptations (see note).
FallBack = Initiates T.38 fax
relay. If the T.38 negotiation
fails, the gateway re-initiates a
fax session using the coder
G.711 A-Law/m-Law with
adaptations (see note 1).
Notes:
Fax adaptations:
-Echo Canceller = On
-Silence Compression
= Off
-Echo Canceler Non-
Linear Processor Mode
= Off
-Dynamic Jitter Buffer
Minimum Delay = 40
-Dynamic Jitter Buffer
Optimization Factor =
13
If the gateway initiates a fax
session using G.711 , a
'gpmd' attribute is added to
the SDP in the following
format:
-For A-law: 'a=gpmd:0
vbd=yes;ecan=on'.
-For m-law: 'a=gpmd:8
vbd=yes;ecan=on'.
When 'IsFaxUsed' is set to
any value besided NoFax the
parameter
'FaxTransportMode' is
ignored.
When the value of
IsFaxUsed is other than T38,
T.38 might still be used
without the control protocol's
involvement. To completely
disable T.38, set
FaxTransportMode to a
value other than 1.
Summary of Contents for Mediant 8000
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Page 33: ...Part I Hardware Overview This part describes the hardware overview of the Mediant 8000 chassis...
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Page 775: ...Part VI Maintenance This part describes the Mediant 8000 maintenance procedures...
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Page 879: ...Part VIII Appendices This part describes additional Mediant 8000 configuration procedures...
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Page 924: ...Media Gateway Mediant 8000 www audiocodes com Installation Operation Maintenance Manual...