AudioCodes Mediant 3000 User Manual page 185
Gateway & enterprise sbc, family of media gateways & session border controllers
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Also See for Mediant 3000:
- User manual (1070 pages) ,
- Installation manual (90 pages) ,
- Hardware installation manual (88 pages)
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User's Manual
The network packets generated and received during the bypass period are regular voice
RTP packets (per the selected bypass coder), but with a different RTP payload type
according to the following parameters:
'Fax Bypass Payload Type' (FaxBypassPayloadType)
ModemBypassPayloadType (ini file)
During the bypass period, the coder uses the packing factor, configured by the 'Fax/Modem
Bypass Packing Factor' parameter (FaxModemBypassM). The packing factor determines
the
number
FaxModemBypassBasicRTPPacketInterval) that are used to generate a single fax/modem
bypass packet. When fax/modem transmission ends, the reverse switching, from bypass
coder to regular voice coder is performed.
To configure fax / modem bypass mode:
1.
In the SIP General Parameters page (Configuration tab > VoIP menu > SIP
Definitions > General Parameters), set the 'Fax Signaling Method' parameter to No
Fax (IsFaxUsed = 0).
2.
In the Fax/Modem/CID Settings page, do the following:
a.
Set the 'Fax Transport Mode' parameter to Bypass (FaxTransportMode = 2).
b.
Set the 'V.21 Modem Transport Type' parameter to Enable Bypass
(V21ModemTransportType = 2).
c.
Set the 'V.22 Modem Transport Type' parameter to Enable Bypass
(V22ModemTransportType = 2).
d.
Set the 'V.23 Modem Transport Type' parameter to Enable Bypass
(V23ModemTransportType = 2).
e.
Set the 'V.32 Modem Transport Type' parameter to Enable Bypass
(V32ModemTransportType = 2).
f.
Set the 'V.34 Modem Transport Type' parameter to Enable Bypass
(V34ModemTransportType = 2).
3.
Set the ini file parameter, BellModemTransportType to 2 (Bypass).
4.
Configure the following optional parameters:
•
'Fax/Modem Bypass Coder Type' (FaxModemBypassCoderType).
•
'Fax Bypass Payload Type' (FaxBypassPayloadType) - in the RTP/RTCP
Settings page (Configuration tab > VoIP menu > Media > RTP/RTCP Settings).
•
ModemBypassPayloadType (ini file).
•
FaxModemBypassBasicRTPPacketInterval (ini file).
•
FaxModemBypasDJBufMinDelay (ini file).
Note:
modems are not supported and fail as a result.
Tip:
voice and doesn't change the coder payload type for fax or modem transmission, it is
recommended to use the Bypass mode with the following configuration:
•
EnableFaxModemInbandNetworkDetection = 1.
•
'Fax/Modem Bypass Coder Type' = same coder used for voice.
•
'Fax/Modem Bypass Packing Factor'(FaxModemBypassM) = same interval as
voice.
•
ModemBypassPayloadType = 8 if voice coder is A-Law or 0 if voice coder is Mu-
Law.
Version 6.8
of
coder
When the device is configured for modem bypass and T.38 fax, V.21 low-speed
When the remote (non-AudioCodes) gateway uses the G.711 coder for
payloads
(each
185
15. Media
the
size
of
Mediant 3000
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