Outbound call answered by Fax machine RRS feed

  • Question

  • When we make an outbound call and the other end is picked up by a Fax machine, our SIP provider sends a T.38 re-INVITE. 


    Is there any way of intercepting this re-INVITE and then ending the call?  Right now, MSS is responding with a 488, which is fine, but we'd like to make note that the phone number was a Fax machine.




    Friday, May 23, 2008 6:06 PM

All replies

  • Subscribe to ITelephonySession.Redirecting.  Properties on RedirectingEventArgs should give you want you need.

    Monday, June 23, 2008 3:00 PM
  • The description for Redirecting says "Raised when a SIP redirect (302) is received.


    What about ITelephonySession.RedirectMediaRequested or ITelephonySession.RedirectMediaCompleted?  What is the e.RemoteMediaDescription property for these?  Is it the entire SDP or just a section? 


    Monday, June 23, 2008 7:13 PM
  • Ah, sorry, reInvite rather than redirect. My mistake.  Yes, RedirectMediaRequested may be what you want.  Try it.  RedirectMediaCompleted is the pair for RedirectMediaAsync, so is not what you want.
    Monday, June 23, 2008 7:35 PM