AudioCodes Mediant 4000 SBC User Manual page 200
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Also See for Mediant 4000 SBC:
- User manual (964 pages) ,
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- User manual (822 pages)
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CHAPTER 15 Media
➢
To enable support for V.34 fax relay (T.38) at SG3 speed:
1.
In the IP Profiles table (see
Signaling Method' parameter (IpProfile_IsFaxUsed) set to T.38 Relay.
2.
In the Coder Groups table (see
G.729 (or any other supported codec).
3.
On the Fax/Modem/CID Settings page, do the following settings:
●
'SIP T.38 Version' to Version 3 (SIPT38Version = 3).
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'Fax Relay Max Rate' (RelayMaxRate) to 33,600bps (default).
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'CNG Detector Mode' (CNGDetectorMode) to Disable (default).
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'V.21 Modem Transport Type' to Disable (V21ModemTransportType = 0).
●
'V.22 Modem Transport Type' to Disable (V22ModemTransportType = 0).
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'V.23 Modem Transport Type' to Disable (V23ModemTransportType = 0).
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'V.32 Modem Transport Type' to Disable (V32ModemTransportType = 0).
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'V.34 Modem Transport Type' to Disable (V34ModemTransportType = 0).
●
'CED Transfer Mode' to Fax Relay or VBD (CEDTransferMode = 0).
4.
Set the ini file parameter, V34FaxTransportType to 1 (i.e., relay).
5.
Set the ini file parameter, T38MaxDatagramSize to 560 (default).
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For example, the device sends or receives the following INVITE message, negotiating both audio
and image media:
INVITE sip:2001@10.8.211.250;user=phone SIP/2.0
Via: SIP/2.0/UDP 10.8.6.55;branch=z9hG4bKac1938966220
Max-Forwards: 70
From: <sip:318@10.8.6.55>;tag=1c1938956155
To: <sip:2001@10.8.211.250;user=phone>
Call-ID: 193895529241200022331@10.8.6.55
CSeq: 1 INVITE
Contact: <sip:318@10.8.6.55:5060>
Supported: em,100rel,timer,replaces,path,resource-priority,sdp-anat
Allow:
REGISTER,OPTIONS,INVITE,ACK,CANCEL,BYE,NOTIFY,PRACK,REFER,INFO,SU
BSCRIBE,UPDATE
Remote-Party-ID: <sip:318@10.8.211.250>;party=calling;privacy=off;screen=no;screen-
ind=0;npi=1;ton=0
Remote-Party-ID: <sip:2001@10.8.211.250>;party=called;npi=1;ton=0
User-Agent: AudioCodes-Sip-Gateway-/7.20A.252.011
Content-Type: application/sdp
Content-Length: 433
v=0
o=AudioCodesGW 1938931006 1938930708 IN IP4 10.8.6.55
s=Phone-Call
Configuring IP
Configuring Coder
The T.38 negotiation should be completed at call start according to V.152
procedure (as shown in the INVITE example below).
T.38 mid-call Re-INVITEs are supported.
If the remote party supports only T.38 Version 0, the device "downgrades" the T.38
Version 3 to T.38 Version 0.
Profiles), configure an IP Profile with the 'Fax
Groups) set the coder used by the device to
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Mediant 4000 SBC | User's Manual
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Troubleshooting
