I am trying to setup faxing in Exchange UM. Microsoft does a great job at defining how voice mail should be setup and how to configure sip on the call manager (running cisco CCM 5.1). I have followed these steps properly and I am able to receive vm on Exchange UM however the fax service does not work and I am confused as to how it should be setup. According to the documentation as long as I have t38 configure on my voice gateway Exchange UM should be able to recognize an incoming call as fax. I have tested this and it is not working. When I send an external fax i can here it go to my voice message and then the call is drop. Do I have to create anothe sip trunk for fax. Is there a special setting I have to put into my current sip trunk for fax to be recognized. Here are my settings -On the Voice gateway I am running mgcp and t38 is enabled globally. on the mail recipeint in exchange and the Dial plan I have enabled receipt of fax.