Outbound Fax Failure - Caused by the Codec Negotiation Failure

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 different thing in 200 OK. 
This is the log of fax failure:
 
mceclip0.png
 
 
 The PCAP captured  on the other device which the fax is working fine shows the A-law as the first priority codec.
 
mceclip1.png
 
 
Solution
 
 
Change the first priority codec on S PBX SIP trunk as a-law.
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