we are using an SPA122 behind an asterisk 1.8 pbx with t.38 pathtrough to our sip provider qsc which offers t.38. Some faxes are successful with t.38 and some not. I did an trace with wireshark and can see that when faxes are unsuccessfull i get back an error like 488 not acceptable here. When i merge the 2 logs i can see that after the t.38 invite the successfull call sends an additional 19.183286| 200 OK SDP (t38) to our provider. May someone knows this problem and what causes this? Here are the 2 logs from such calls:
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