I am trying to fax from a VG224 configured as MGCP. I have a 2821 configured as a H323 CUBE. A Verizon SIP trunk is connected to the 2821. So the fax flow is this:
VG224-->H323 CUBE-->SIP-->SIP provider.
I can't make it work since the fax call will never negotiate G711 codec. Has anyone ever make this work? It works if I configure the Vg224 as h323 but this is a management nightmare with all the dial peers as we have a lot of fax machines. If anyone has made faxing from MGCP thru SIP work I would appreciate some config samples. Thank you.