T.38 Outbound Fax Failure - The Provider doesn't Fully Support T.38 Fax

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Applicability
  • Firmware version: Any
  • Model: S-Series
 
Problem Description
 
A SIP trunk is created for inbound and outbound fax on S PBX.
Inbound fax is working fine, but the outbound fax not.
Fax machine is connected to the FXS port of S PBX.
 
Analysis
 
The PCAP log shows the T.38 fax is not initiated after Re-INVITE from provider.
 
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Try to enable Error Correction on PBX, same issue.
 
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Solution
 
Disable the T.38 Re-INVITE on provider side.
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