Can Open SIPS detect a FAX?

  • GCR

    GCR - 2010-11-08


    I have need of automatically detecting whether I have called a FAX.  If I am using OpenSIPS can I do this?  As I understand it, OpenSIPS will get me to the point of connection then a call becomes a peer to peer arrangement meaning OpenSIPS is no longer involved and so has no way of determining anything further about the call.  Is this correct?


  • Bogdan-Andrei Iancu

    Somehow yes, it is correct. Fax over IP works like first setting up a standard VoIP(audio) call and after that using a re-INVITE to switch to T38 codec (fax). So the call is already established when you will detect the FAX indication (by inspecting the SDP of the re-INVITE), so opensips will not to be able to do much.



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