Fax over dahdi and pjsip issue

Asterisk Asterisk Fax
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Hello, could you please help me with this FAX-related issue? :pensive:
Fax Machine >>> FXS (fxo_ks) line >>> chan_dahdi >>> pjsip >>> network (IP) >>> other IP PBX >>> Fax Machine

The fax machine sometimes works and sometimes doesn’t when faxing over IP using G711. T38 is not being used in this case, and instead, the RTP voice data is being transmitted.

I would like to ask, for faxing through the above setup, if some parameters in chan_dahdi.conf, such as faxdetect=both, necessarily need to be enabled. From my understanding, enabling this feature allows DAHDI to detect fax signals and trigger the dial plan in extensions.conf. Currently, we don’t need to run a dial plan for fax functionality, as we are allowing both fax machines to handle this directly.

Additionally, what is the actual function of the faxbuffers parameter?

Could you please help us understand if faxdetect and faxbuffers are useful in this fax setup? Thanks so much!

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